<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkElementIndex;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import static com.google.common.base.Preconditions.checkPositionIndex;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import static com.google.common.base.Preconditions.checkPositionIndexes;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import static com.google.common.base.Preconditions.checkState;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>import com.google.common.annotations.Beta;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import com.google.common.annotations.GwtCompatible;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import com.google.common.annotations.GwtIncompatible;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import com.google.common.annotations.VisibleForTesting;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import com.google.common.base.Function;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import com.google.common.base.Objects;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import com.google.common.primitives.Ints;<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.io.Serializable;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.util.AbstractList;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import java.util.AbstractSequentialList;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import java.util.ArrayList;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import java.util.Arrays;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import java.util.Collection;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import java.util.Collections;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import java.util.Iterator;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import java.util.LinkedList;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import java.util.List;<a name="line.43"></a>
<span class="sourceLineNo">044</span>import java.util.ListIterator;<a name="line.44"></a>
<span class="sourceLineNo">045</span>import java.util.NoSuchElementException;<a name="line.45"></a>
<span class="sourceLineNo">046</span>import java.util.RandomAccess;<a name="line.46"></a>
<span class="sourceLineNo">047</span>import java.util.concurrent.CopyOnWriteArrayList;<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>import javax.annotation.Nullable;<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>/**<a name="line.51"></a>
<span class="sourceLineNo">052</span> * Static utility methods pertaining to {@link List} instances. Also see this<a name="line.52"></a>
<span class="sourceLineNo">053</span> * class's counterparts {@link Sets}, {@link Maps} and {@link Queues}.<a name="line.53"></a>
<span class="sourceLineNo">054</span> *<a name="line.54"></a>
<span class="sourceLineNo">055</span> * &lt;p&gt;See the Guava User Guide article on &lt;a href=<a name="line.55"></a>
<span class="sourceLineNo">056</span> * "http://code.google.com/p/guava-libraries/wiki/CollectionUtilitiesExplained#Lists"&gt;<a name="line.56"></a>
<span class="sourceLineNo">057</span> * {@code Lists}&lt;/a&gt;.<a name="line.57"></a>
<span class="sourceLineNo">058</span> *<a name="line.58"></a>
<span class="sourceLineNo">059</span> * @author Kevin Bourrillion<a name="line.59"></a>
<span class="sourceLineNo">060</span> * @author Mike Bostock<a name="line.60"></a>
<span class="sourceLineNo">061</span> * @author Louis Wasserman<a name="line.61"></a>
<span class="sourceLineNo">062</span> * @since 2.0 (imported from Google Collections Library)<a name="line.62"></a>
<span class="sourceLineNo">063</span> */<a name="line.63"></a>
<span class="sourceLineNo">064</span>@GwtCompatible(emulated = true)<a name="line.64"></a>
<span class="sourceLineNo">065</span>public final class Lists {<a name="line.65"></a>
<span class="sourceLineNo">066</span>  private Lists() {}<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>  // ArrayList<a name="line.68"></a>
<span class="sourceLineNo">069</span><a name="line.69"></a>
<span class="sourceLineNo">070</span>  /**<a name="line.70"></a>
<span class="sourceLineNo">071</span>   * Creates a &lt;i&gt;mutable&lt;/i&gt;, empty {@code ArrayList} instance.<a name="line.71"></a>
<span class="sourceLineNo">072</span>   *<a name="line.72"></a>
<span class="sourceLineNo">073</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; if mutability is not required, use {@link<a name="line.73"></a>
<span class="sourceLineNo">074</span>   * ImmutableList#of()} instead.<a name="line.74"></a>
<span class="sourceLineNo">075</span>   *<a name="line.75"></a>
<span class="sourceLineNo">076</span>   * @return a new, empty {@code ArrayList}<a name="line.76"></a>
<span class="sourceLineNo">077</span>   */<a name="line.77"></a>
<span class="sourceLineNo">078</span>  @GwtCompatible(serializable = true)<a name="line.78"></a>
<span class="sourceLineNo">079</span>  public static &lt;E&gt; ArrayList&lt;E&gt; newArrayList() {<a name="line.79"></a>
<span class="sourceLineNo">080</span>    return new ArrayList&lt;E&gt;();<a name="line.80"></a>
<span class="sourceLineNo">081</span>  }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>  /**<a name="line.83"></a>
<span class="sourceLineNo">084</span>   * Creates a &lt;i&gt;mutable&lt;/i&gt; {@code ArrayList} instance containing the given<a name="line.84"></a>
<span class="sourceLineNo">085</span>   * elements.<a name="line.85"></a>
<span class="sourceLineNo">086</span>   *<a name="line.86"></a>
<span class="sourceLineNo">087</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; if mutability is not required and the elements are<a name="line.87"></a>
<span class="sourceLineNo">088</span>   * non-null, use an overload of {@link ImmutableList#of()} (for varargs) or<a name="line.88"></a>
<span class="sourceLineNo">089</span>   * {@link ImmutableList#copyOf(Object[])} (for an array) instead.<a name="line.89"></a>
<span class="sourceLineNo">090</span>   *<a name="line.90"></a>
<span class="sourceLineNo">091</span>   * @param elements the elements that the list should contain, in order<a name="line.91"></a>
<span class="sourceLineNo">092</span>   * @return a new {@code ArrayList} containing those elements<a name="line.92"></a>
<span class="sourceLineNo">093</span>   */<a name="line.93"></a>
<span class="sourceLineNo">094</span>  @GwtCompatible(serializable = true)<a name="line.94"></a>
<span class="sourceLineNo">095</span>  public static &lt;E&gt; ArrayList&lt;E&gt; newArrayList(E... elements) {<a name="line.95"></a>
<span class="sourceLineNo">096</span>    checkNotNull(elements); // for GWT<a name="line.96"></a>
<span class="sourceLineNo">097</span>    // Avoid integer overflow when a large array is passed in<a name="line.97"></a>
<span class="sourceLineNo">098</span>    int capacity = computeArrayListCapacity(elements.length);<a name="line.98"></a>
<span class="sourceLineNo">099</span>    ArrayList&lt;E&gt; list = new ArrayList&lt;E&gt;(capacity);<a name="line.99"></a>
<span class="sourceLineNo">100</span>    Collections.addAll(list, elements);<a name="line.100"></a>
<span class="sourceLineNo">101</span>    return list;<a name="line.101"></a>
<span class="sourceLineNo">102</span>  }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>  @VisibleForTesting static int computeArrayListCapacity(int arraySize) {<a name="line.104"></a>
<span class="sourceLineNo">105</span>    checkArgument(arraySize &gt;= 0);<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span>    // TODO(kevinb): Figure out the right behavior, and document it<a name="line.107"></a>
<span class="sourceLineNo">108</span>    return Ints.saturatedCast(5L + arraySize + (arraySize / 10));<a name="line.108"></a>
<span class="sourceLineNo">109</span>  }<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span>  /**<a name="line.111"></a>
<span class="sourceLineNo">112</span>   * Creates a &lt;i&gt;mutable&lt;/i&gt; {@code ArrayList} instance containing the given<a name="line.112"></a>
<span class="sourceLineNo">113</span>   * elements.<a name="line.113"></a>
<span class="sourceLineNo">114</span>   *<a name="line.114"></a>
<span class="sourceLineNo">115</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; if mutability is not required and the elements are<a name="line.115"></a>
<span class="sourceLineNo">116</span>   * non-null, use {@link ImmutableList#copyOf(Iterator)} instead.<a name="line.116"></a>
<span class="sourceLineNo">117</span>   *<a name="line.117"></a>
<span class="sourceLineNo">118</span>   * @param elements the elements that the list should contain, in order<a name="line.118"></a>
<span class="sourceLineNo">119</span>   * @return a new {@code ArrayList} containing those elements<a name="line.119"></a>
<span class="sourceLineNo">120</span>   */<a name="line.120"></a>
<span class="sourceLineNo">121</span>  @GwtCompatible(serializable = true)<a name="line.121"></a>
<span class="sourceLineNo">122</span>  public static &lt;E&gt; ArrayList&lt;E&gt; newArrayList(Iterable&lt;? extends E&gt; elements) {<a name="line.122"></a>
<span class="sourceLineNo">123</span>    checkNotNull(elements); // for GWT<a name="line.123"></a>
<span class="sourceLineNo">124</span>    // Let ArrayList's sizing logic work, if possible<a name="line.124"></a>
<span class="sourceLineNo">125</span>    return (elements instanceof Collection)<a name="line.125"></a>
<span class="sourceLineNo">126</span>        ? new ArrayList&lt;E&gt;(Collections2.cast(elements))<a name="line.126"></a>
<span class="sourceLineNo">127</span>        : newArrayList(elements.iterator());<a name="line.127"></a>
<span class="sourceLineNo">128</span>  }<a name="line.128"></a>
<span class="sourceLineNo">129</span><a name="line.129"></a>
<span class="sourceLineNo">130</span>  /**<a name="line.130"></a>
<span class="sourceLineNo">131</span>   * Creates a &lt;i&gt;mutable&lt;/i&gt; {@code ArrayList} instance containing the given<a name="line.131"></a>
<span class="sourceLineNo">132</span>   * elements.<a name="line.132"></a>
<span class="sourceLineNo">133</span>   *<a name="line.133"></a>
<span class="sourceLineNo">134</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; if mutability is not required and the elements are<a name="line.134"></a>
<span class="sourceLineNo">135</span>   * non-null, use {@link ImmutableList#copyOf(Iterator)} instead.<a name="line.135"></a>
<span class="sourceLineNo">136</span>   *<a name="line.136"></a>
<span class="sourceLineNo">137</span>   * @param elements the elements that the list should contain, in order<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * @return a new {@code ArrayList} containing those elements<a name="line.138"></a>
<span class="sourceLineNo">139</span>   */<a name="line.139"></a>
<span class="sourceLineNo">140</span>  @GwtCompatible(serializable = true)<a name="line.140"></a>
<span class="sourceLineNo">141</span>  public static &lt;E&gt; ArrayList&lt;E&gt; newArrayList(Iterator&lt;? extends E&gt; elements) {<a name="line.141"></a>
<span class="sourceLineNo">142</span>    checkNotNull(elements); // for GWT<a name="line.142"></a>
<span class="sourceLineNo">143</span>    ArrayList&lt;E&gt; list = newArrayList();<a name="line.143"></a>
<span class="sourceLineNo">144</span>    while (elements.hasNext()) {<a name="line.144"></a>
<span class="sourceLineNo">145</span>      list.add(elements.next());<a name="line.145"></a>
<span class="sourceLineNo">146</span>    }<a name="line.146"></a>
<span class="sourceLineNo">147</span>    return list;<a name="line.147"></a>
<span class="sourceLineNo">148</span>  }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span>  /**<a name="line.150"></a>
<span class="sourceLineNo">151</span>   * Creates an {@code ArrayList} instance backed by an array of the<a name="line.151"></a>
<span class="sourceLineNo">152</span>   * &lt;i&gt;exact&lt;/i&gt; size specified; equivalent to<a name="line.152"></a>
<span class="sourceLineNo">153</span>   * {@link ArrayList#ArrayList(int)}.<a name="line.153"></a>
<span class="sourceLineNo">154</span>   *<a name="line.154"></a>
<span class="sourceLineNo">155</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; if you know the exact size your list will be, consider<a name="line.155"></a>
<span class="sourceLineNo">156</span>   * using a fixed-size list ({@link Arrays#asList(Object[])}) or an {@link<a name="line.156"></a>
<span class="sourceLineNo">157</span>   * ImmutableList} instead of a growable {@link ArrayList}.<a name="line.157"></a>
<span class="sourceLineNo">158</span>   *<a name="line.158"></a>
<span class="sourceLineNo">159</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; If you have only an &lt;i&gt;estimate&lt;/i&gt; of the eventual size of<a name="line.159"></a>
<span class="sourceLineNo">160</span>   * the list, consider padding this estimate by a suitable amount, or simply<a name="line.160"></a>
<span class="sourceLineNo">161</span>   * use {@link #newArrayListWithExpectedSize(int)} instead.<a name="line.161"></a>
<span class="sourceLineNo">162</span>   *<a name="line.162"></a>
<span class="sourceLineNo">163</span>   * @param initialArraySize the exact size of the initial backing array for<a name="line.163"></a>
<span class="sourceLineNo">164</span>   *     the returned array list ({@code ArrayList} documentation calls this<a name="line.164"></a>
<span class="sourceLineNo">165</span>   *     value the "capacity")<a name="line.165"></a>
<span class="sourceLineNo">166</span>   * @return a new, empty {@code ArrayList} which is guaranteed not to resize<a name="line.166"></a>
<span class="sourceLineNo">167</span>   *     itself unless its size reaches {@code initialArraySize + 1}<a name="line.167"></a>
<span class="sourceLineNo">168</span>   * @throws IllegalArgumentException if {@code initialArraySize} is negative<a name="line.168"></a>
<span class="sourceLineNo">169</span>   */<a name="line.169"></a>
<span class="sourceLineNo">170</span>  @GwtCompatible(serializable = true)<a name="line.170"></a>
<span class="sourceLineNo">171</span>  public static &lt;E&gt; ArrayList&lt;E&gt; newArrayListWithCapacity(<a name="line.171"></a>
<span class="sourceLineNo">172</span>      int initialArraySize) {<a name="line.172"></a>
<span class="sourceLineNo">173</span>    checkArgument(initialArraySize &gt;= 0);  // for GWT.<a name="line.173"></a>
<span class="sourceLineNo">174</span>    return new ArrayList&lt;E&gt;(initialArraySize);<a name="line.174"></a>
<span class="sourceLineNo">175</span>  }<a name="line.175"></a>
<span class="sourceLineNo">176</span><a name="line.176"></a>
<span class="sourceLineNo">177</span>  /**<a name="line.177"></a>
<span class="sourceLineNo">178</span>   * Creates an {@code ArrayList} instance sized appropriately to hold an<a name="line.178"></a>
<span class="sourceLineNo">179</span>   * &lt;i&gt;estimated&lt;/i&gt; number of elements without resizing. A small amount of<a name="line.179"></a>
<span class="sourceLineNo">180</span>   * padding is added in case the estimate is low.<a name="line.180"></a>
<span class="sourceLineNo">181</span>   *<a name="line.181"></a>
<span class="sourceLineNo">182</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; If you know the &lt;i&gt;exact&lt;/i&gt; number of elements the list<a name="line.182"></a>
<span class="sourceLineNo">183</span>   * will hold, or prefer to calculate your own amount of padding, refer to<a name="line.183"></a>
<span class="sourceLineNo">184</span>   * {@link #newArrayListWithCapacity(int)}.<a name="line.184"></a>
<span class="sourceLineNo">185</span>   *<a name="line.185"></a>
<span class="sourceLineNo">186</span>   * @param estimatedSize an estimate of the eventual {@link List#size()} of<a name="line.186"></a>
<span class="sourceLineNo">187</span>   *     the new list<a name="line.187"></a>
<span class="sourceLineNo">188</span>   * @return a new, empty {@code ArrayList}, sized appropriately to hold the<a name="line.188"></a>
<span class="sourceLineNo">189</span>   *     estimated number of elements<a name="line.189"></a>
<span class="sourceLineNo">190</span>   * @throws IllegalArgumentException if {@code estimatedSize} is negative<a name="line.190"></a>
<span class="sourceLineNo">191</span>   */<a name="line.191"></a>
<span class="sourceLineNo">192</span>  @GwtCompatible(serializable = true)<a name="line.192"></a>
<span class="sourceLineNo">193</span>  public static &lt;E&gt; ArrayList&lt;E&gt; newArrayListWithExpectedSize(<a name="line.193"></a>
<span class="sourceLineNo">194</span>      int estimatedSize) {<a name="line.194"></a>
<span class="sourceLineNo">195</span>    return new ArrayList&lt;E&gt;(computeArrayListCapacity(estimatedSize));<a name="line.195"></a>
<span class="sourceLineNo">196</span>  }<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span>  // LinkedList<a name="line.198"></a>
<span class="sourceLineNo">199</span><a name="line.199"></a>
<span class="sourceLineNo">200</span>  /**<a name="line.200"></a>
<span class="sourceLineNo">201</span>   * Creates an empty {@code LinkedList} instance.<a name="line.201"></a>
<span class="sourceLineNo">202</span>   *<a name="line.202"></a>
<span class="sourceLineNo">203</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; if you need an immutable empty {@link List}, use<a name="line.203"></a>
<span class="sourceLineNo">204</span>   * {@link ImmutableList#of()} instead.<a name="line.204"></a>
<span class="sourceLineNo">205</span>   *<a name="line.205"></a>
<span class="sourceLineNo">206</span>   * @return a new, empty {@code LinkedList}<a name="line.206"></a>
<span class="sourceLineNo">207</span>   */<a name="line.207"></a>
<span class="sourceLineNo">208</span>  @GwtCompatible(serializable = true)<a name="line.208"></a>
<span class="sourceLineNo">209</span>  public static &lt;E&gt; LinkedList&lt;E&gt; newLinkedList() {<a name="line.209"></a>
<span class="sourceLineNo">210</span>    return new LinkedList&lt;E&gt;();<a name="line.210"></a>
<span class="sourceLineNo">211</span>  }<a name="line.211"></a>
<span class="sourceLineNo">212</span><a name="line.212"></a>
<span class="sourceLineNo">213</span>  /**<a name="line.213"></a>
<span class="sourceLineNo">214</span>   * Creates a {@code LinkedList} instance containing the given elements.<a name="line.214"></a>
<span class="sourceLineNo">215</span>   *<a name="line.215"></a>
<span class="sourceLineNo">216</span>   * @param elements the elements that the list should contain, in order<a name="line.216"></a>
<span class="sourceLineNo">217</span>   * @return a new {@code LinkedList} containing those elements<a name="line.217"></a>
<span class="sourceLineNo">218</span>   */<a name="line.218"></a>
<span class="sourceLineNo">219</span>  @GwtCompatible(serializable = true)<a name="line.219"></a>
<span class="sourceLineNo">220</span>  public static &lt;E&gt; LinkedList&lt;E&gt; newLinkedList(<a name="line.220"></a>
<span class="sourceLineNo">221</span>      Iterable&lt;? extends E&gt; elements) {<a name="line.221"></a>
<span class="sourceLineNo">222</span>    LinkedList&lt;E&gt; list = newLinkedList();<a name="line.222"></a>
<span class="sourceLineNo">223</span>    for (E element : elements) {<a name="line.223"></a>
<span class="sourceLineNo">224</span>      list.add(element);<a name="line.224"></a>
<span class="sourceLineNo">225</span>    }<a name="line.225"></a>
<span class="sourceLineNo">226</span>    return list;<a name="line.226"></a>
<span class="sourceLineNo">227</span>  }<a name="line.227"></a>
<span class="sourceLineNo">228</span><a name="line.228"></a>
<span class="sourceLineNo">229</span>  /**<a name="line.229"></a>
<span class="sourceLineNo">230</span>   * Creates an empty {@code CopyOnWriteArrayList} instance.<a name="line.230"></a>
<span class="sourceLineNo">231</span>   *<a name="line.231"></a>
<span class="sourceLineNo">232</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; if you need an immutable empty {@link List}, use<a name="line.232"></a>
<span class="sourceLineNo">233</span>   * {@link Collections#emptyList} instead.<a name="line.233"></a>
<span class="sourceLineNo">234</span>   *<a name="line.234"></a>
<span class="sourceLineNo">235</span>   * @return a new, empty {@code CopyOnWriteArrayList}<a name="line.235"></a>
<span class="sourceLineNo">236</span>   * @since 12.0<a name="line.236"></a>
<span class="sourceLineNo">237</span>   */<a name="line.237"></a>
<span class="sourceLineNo">238</span>  @GwtIncompatible("CopyOnWriteArrayList")<a name="line.238"></a>
<span class="sourceLineNo">239</span>  public static &lt;E&gt; CopyOnWriteArrayList&lt;E&gt; newCopyOnWriteArrayList() {<a name="line.239"></a>
<span class="sourceLineNo">240</span>    return new CopyOnWriteArrayList&lt;E&gt;();<a name="line.240"></a>
<span class="sourceLineNo">241</span>  }<a name="line.241"></a>
<span class="sourceLineNo">242</span><a name="line.242"></a>
<span class="sourceLineNo">243</span>  /**<a name="line.243"></a>
<span class="sourceLineNo">244</span>   * Creates a {@code CopyOnWriteArrayList} instance containing the given elements.<a name="line.244"></a>
<span class="sourceLineNo">245</span>   *<a name="line.245"></a>
<span class="sourceLineNo">246</span>   * @param elements the elements that the list should contain, in order<a name="line.246"></a>
<span class="sourceLineNo">247</span>   * @return a new {@code CopyOnWriteArrayList} containing those elements<a name="line.247"></a>
<span class="sourceLineNo">248</span>   * @since 12.0<a name="line.248"></a>
<span class="sourceLineNo">249</span>   */<a name="line.249"></a>
<span class="sourceLineNo">250</span>  @GwtIncompatible("CopyOnWriteArrayList")<a name="line.250"></a>
<span class="sourceLineNo">251</span>  public static &lt;E&gt; CopyOnWriteArrayList&lt;E&gt; newCopyOnWriteArrayList(<a name="line.251"></a>
<span class="sourceLineNo">252</span>      Iterable&lt;? extends E&gt; elements) {<a name="line.252"></a>
<span class="sourceLineNo">253</span>    // We copy elements to an ArrayList first, rather than incurring the<a name="line.253"></a>
<span class="sourceLineNo">254</span>    // quadratic cost of adding them to the COWAL directly.<a name="line.254"></a>
<span class="sourceLineNo">255</span>    Collection&lt;? extends E&gt; elementsCollection = (elements instanceof Collection)<a name="line.255"></a>
<span class="sourceLineNo">256</span>        ? Collections2.cast(elements)<a name="line.256"></a>
<span class="sourceLineNo">257</span>        : newArrayList(elements);<a name="line.257"></a>
<span class="sourceLineNo">258</span>    return new CopyOnWriteArrayList&lt;E&gt;(elementsCollection);<a name="line.258"></a>
<span class="sourceLineNo">259</span>  }<a name="line.259"></a>
<span class="sourceLineNo">260</span><a name="line.260"></a>
<span class="sourceLineNo">261</span>  /**<a name="line.261"></a>
<span class="sourceLineNo">262</span>   * Returns an unmodifiable list containing the specified first element and<a name="line.262"></a>
<span class="sourceLineNo">263</span>   * backed by the specified array of additional elements. Changes to the {@code<a name="line.263"></a>
<span class="sourceLineNo">264</span>   * rest} array will be reflected in the returned list. Unlike {@link<a name="line.264"></a>
<span class="sourceLineNo">265</span>   * Arrays#asList}, the returned list is unmodifiable.<a name="line.265"></a>
<span class="sourceLineNo">266</span>   *<a name="line.266"></a>
<span class="sourceLineNo">267</span>   * &lt;p&gt;This is useful when a varargs method needs to use a signature such as<a name="line.267"></a>
<span class="sourceLineNo">268</span>   * {@code (Foo firstFoo, Foo... moreFoos)}, in order to avoid overload<a name="line.268"></a>
<span class="sourceLineNo">269</span>   * ambiguity or to enforce a minimum argument count.<a name="line.269"></a>
<span class="sourceLineNo">270</span>   *<a name="line.270"></a>
<span class="sourceLineNo">271</span>   * &lt;p&gt;The returned list is serializable and implements {@link RandomAccess}.<a name="line.271"></a>
<span class="sourceLineNo">272</span>   *<a name="line.272"></a>
<span class="sourceLineNo">273</span>   * @param first the first element<a name="line.273"></a>
<span class="sourceLineNo">274</span>   * @param rest an array of additional elements, possibly empty<a name="line.274"></a>
<span class="sourceLineNo">275</span>   * @return an unmodifiable list containing the specified elements<a name="line.275"></a>
<span class="sourceLineNo">276</span>   */<a name="line.276"></a>
<span class="sourceLineNo">277</span>  public static &lt;E&gt; List&lt;E&gt; asList(@Nullable E first, E[] rest) {<a name="line.277"></a>
<span class="sourceLineNo">278</span>    return new OnePlusArrayList&lt;E&gt;(first, rest);<a name="line.278"></a>
<span class="sourceLineNo">279</span>  }<a name="line.279"></a>
<span class="sourceLineNo">280</span><a name="line.280"></a>
<span class="sourceLineNo">281</span>  /** @see Lists#asList(Object, Object[]) */<a name="line.281"></a>
<span class="sourceLineNo">282</span>  private static class OnePlusArrayList&lt;E&gt; extends AbstractList&lt;E&gt;<a name="line.282"></a>
<span class="sourceLineNo">283</span>      implements Serializable, RandomAccess {<a name="line.283"></a>
<span class="sourceLineNo">284</span>    final E first;<a name="line.284"></a>
<span class="sourceLineNo">285</span>    final E[] rest;<a name="line.285"></a>
<span class="sourceLineNo">286</span><a name="line.286"></a>
<span class="sourceLineNo">287</span>    OnePlusArrayList(@Nullable E first, E[] rest) {<a name="line.287"></a>
<span class="sourceLineNo">288</span>      this.first = first;<a name="line.288"></a>
<span class="sourceLineNo">289</span>      this.rest = checkNotNull(rest);<a name="line.289"></a>
<span class="sourceLineNo">290</span>    }<a name="line.290"></a>
<span class="sourceLineNo">291</span>    @Override public int size() {<a name="line.291"></a>
<span class="sourceLineNo">292</span>      return rest.length + 1;<a name="line.292"></a>
<span class="sourceLineNo">293</span>    }<a name="line.293"></a>
<span class="sourceLineNo">294</span>    @Override public E get(int index) {<a name="line.294"></a>
<span class="sourceLineNo">295</span>      // check explicitly so the IOOBE will have the right message<a name="line.295"></a>
<span class="sourceLineNo">296</span>      checkElementIndex(index, size());<a name="line.296"></a>
<span class="sourceLineNo">297</span>      return (index == 0) ? first : rest[index - 1];<a name="line.297"></a>
<span class="sourceLineNo">298</span>    }<a name="line.298"></a>
<span class="sourceLineNo">299</span>    private static final long serialVersionUID = 0;<a name="line.299"></a>
<span class="sourceLineNo">300</span>  }<a name="line.300"></a>
<span class="sourceLineNo">301</span><a name="line.301"></a>
<span class="sourceLineNo">302</span>  /**<a name="line.302"></a>
<span class="sourceLineNo">303</span>   * Returns an unmodifiable list containing the specified first and second<a name="line.303"></a>
<span class="sourceLineNo">304</span>   * element, and backed by the specified array of additional elements. Changes<a name="line.304"></a>
<span class="sourceLineNo">305</span>   * to the {@code rest} array will be reflected in the returned list. Unlike<a name="line.305"></a>
<span class="sourceLineNo">306</span>   * {@link Arrays#asList}, the returned list is unmodifiable.<a name="line.306"></a>
<span class="sourceLineNo">307</span>   *<a name="line.307"></a>
<span class="sourceLineNo">308</span>   * &lt;p&gt;This is useful when a varargs method needs to use a signature such as<a name="line.308"></a>
<span class="sourceLineNo">309</span>   * {@code (Foo firstFoo, Foo secondFoo, Foo... moreFoos)}, in order to avoid<a name="line.309"></a>
<span class="sourceLineNo">310</span>   * overload ambiguity or to enforce a minimum argument count.<a name="line.310"></a>
<span class="sourceLineNo">311</span>   *<a name="line.311"></a>
<span class="sourceLineNo">312</span>   * &lt;p&gt;The returned list is serializable and implements {@link RandomAccess}.<a name="line.312"></a>
<span class="sourceLineNo">313</span>   *<a name="line.313"></a>
<span class="sourceLineNo">314</span>   * @param first the first element<a name="line.314"></a>
<span class="sourceLineNo">315</span>   * @param second the second element<a name="line.315"></a>
<span class="sourceLineNo">316</span>   * @param rest an array of additional elements, possibly empty<a name="line.316"></a>
<span class="sourceLineNo">317</span>   * @return an unmodifiable list containing the specified elements<a name="line.317"></a>
<span class="sourceLineNo">318</span>   */<a name="line.318"></a>
<span class="sourceLineNo">319</span>  public static &lt;E&gt; List&lt;E&gt; asList(<a name="line.319"></a>
<span class="sourceLineNo">320</span>      @Nullable E first, @Nullable E second, E[] rest) {<a name="line.320"></a>
<span class="sourceLineNo">321</span>    return new TwoPlusArrayList&lt;E&gt;(first, second, rest);<a name="line.321"></a>
<span class="sourceLineNo">322</span>  }<a name="line.322"></a>
<span class="sourceLineNo">323</span><a name="line.323"></a>
<span class="sourceLineNo">324</span>  /** @see Lists#asList(Object, Object, Object[]) */<a name="line.324"></a>
<span class="sourceLineNo">325</span>  private static class TwoPlusArrayList&lt;E&gt; extends AbstractList&lt;E&gt;<a name="line.325"></a>
<span class="sourceLineNo">326</span>      implements Serializable, RandomAccess {<a name="line.326"></a>
<span class="sourceLineNo">327</span>    final E first;<a name="line.327"></a>
<span class="sourceLineNo">328</span>    final E second;<a name="line.328"></a>
<span class="sourceLineNo">329</span>    final E[] rest;<a name="line.329"></a>
<span class="sourceLineNo">330</span><a name="line.330"></a>
<span class="sourceLineNo">331</span>    TwoPlusArrayList(@Nullable E first, @Nullable E second, E[] rest) {<a name="line.331"></a>
<span class="sourceLineNo">332</span>      this.first = first;<a name="line.332"></a>
<span class="sourceLineNo">333</span>      this.second = second;<a name="line.333"></a>
<span class="sourceLineNo">334</span>      this.rest = checkNotNull(rest);<a name="line.334"></a>
<span class="sourceLineNo">335</span>    }<a name="line.335"></a>
<span class="sourceLineNo">336</span>    @Override public int size() {<a name="line.336"></a>
<span class="sourceLineNo">337</span>      return rest.length + 2;<a name="line.337"></a>
<span class="sourceLineNo">338</span>    }<a name="line.338"></a>
<span class="sourceLineNo">339</span>    @Override public E get(int index) {<a name="line.339"></a>
<span class="sourceLineNo">340</span>      switch (index) {<a name="line.340"></a>
<span class="sourceLineNo">341</span>        case 0:<a name="line.341"></a>
<span class="sourceLineNo">342</span>          return first;<a name="line.342"></a>
<span class="sourceLineNo">343</span>        case 1:<a name="line.343"></a>
<span class="sourceLineNo">344</span>          return second;<a name="line.344"></a>
<span class="sourceLineNo">345</span>        default:<a name="line.345"></a>
<span class="sourceLineNo">346</span>          // check explicitly so the IOOBE will have the right message<a name="line.346"></a>
<span class="sourceLineNo">347</span>          checkElementIndex(index, size());<a name="line.347"></a>
<span class="sourceLineNo">348</span>          return rest[index - 2];<a name="line.348"></a>
<span class="sourceLineNo">349</span>      }<a name="line.349"></a>
<span class="sourceLineNo">350</span>    }<a name="line.350"></a>
<span class="sourceLineNo">351</span>    private static final long serialVersionUID = 0;<a name="line.351"></a>
<span class="sourceLineNo">352</span>  }<a name="line.352"></a>
<span class="sourceLineNo">353</span><a name="line.353"></a>
<span class="sourceLineNo">354</span>  /**<a name="line.354"></a>
<span class="sourceLineNo">355</span>   * Returns every possible list that can be formed by choosing one element<a name="line.355"></a>
<span class="sourceLineNo">356</span>   * from each of the given lists in order; the "n-ary<a name="line.356"></a>
<span class="sourceLineNo">357</span>   * &lt;a href="http://en.wikipedia.org/wiki/Cartesian_product"&gt;Cartesian<a name="line.357"></a>
<span class="sourceLineNo">358</span>   * product&lt;/a&gt;" of the lists. For example: &lt;pre&gt;   {@code<a name="line.358"></a>
<span class="sourceLineNo">359</span>   *<a name="line.359"></a>
<span class="sourceLineNo">360</span>   *   Lists.cartesianProduct(ImmutableList.of(<a name="line.360"></a>
<span class="sourceLineNo">361</span>   *       ImmutableList.of(1, 2),<a name="line.361"></a>
<span class="sourceLineNo">362</span>   *       ImmutableList.of("A", "B", "C")))}&lt;/pre&gt;<a name="line.362"></a>
<span class="sourceLineNo">363</span>   *<a name="line.363"></a>
<span class="sourceLineNo">364</span>   * returns a list containing six lists in the following order:<a name="line.364"></a>
<span class="sourceLineNo">365</span>   *<a name="line.365"></a>
<span class="sourceLineNo">366</span>   * &lt;ul&gt;<a name="line.366"></a>
<span class="sourceLineNo">367</span>   * &lt;li&gt;{@code ImmutableList.of(1, "A")}<a name="line.367"></a>
<span class="sourceLineNo">368</span>   * &lt;li&gt;{@code ImmutableList.of(1, "B")}<a name="line.368"></a>
<span class="sourceLineNo">369</span>   * &lt;li&gt;{@code ImmutableList.of(1, "C")}<a name="line.369"></a>
<span class="sourceLineNo">370</span>   * &lt;li&gt;{@code ImmutableList.of(2, "A")}<a name="line.370"></a>
<span class="sourceLineNo">371</span>   * &lt;li&gt;{@code ImmutableList.of(2, "B")}<a name="line.371"></a>
<span class="sourceLineNo">372</span>   * &lt;li&gt;{@code ImmutableList.of(2, "C")}<a name="line.372"></a>
<span class="sourceLineNo">373</span>   * &lt;/ul&gt;<a name="line.373"></a>
<span class="sourceLineNo">374</span>   *<a name="line.374"></a>
<span class="sourceLineNo">375</span>   * The result is guaranteed to be in the "traditional", lexicographical<a name="line.375"></a>
<span class="sourceLineNo">376</span>   * order for Cartesian products that you would get from nesting for loops:<a name="line.376"></a>
<span class="sourceLineNo">377</span>   * &lt;pre&gt;   {@code<a name="line.377"></a>
<span class="sourceLineNo">378</span>   *<a name="line.378"></a>
<span class="sourceLineNo">379</span>   *   for (B b0 : lists.get(0)) {<a name="line.379"></a>
<span class="sourceLineNo">380</span>   *     for (B b1 : lists.get(1)) {<a name="line.380"></a>
<span class="sourceLineNo">381</span>   *       ...<a name="line.381"></a>
<span class="sourceLineNo">382</span>   *       ImmutableList&lt;B&gt; tuple = ImmutableList.of(b0, b1, ...);<a name="line.382"></a>
<span class="sourceLineNo">383</span>   *       // operate on tuple<a name="line.383"></a>
<span class="sourceLineNo">384</span>   *     }<a name="line.384"></a>
<span class="sourceLineNo">385</span>   *   }}&lt;/pre&gt;<a name="line.385"></a>
<span class="sourceLineNo">386</span>   *<a name="line.386"></a>
<span class="sourceLineNo">387</span>   * Note that if any input list is empty, the Cartesian product will also be<a name="line.387"></a>
<span class="sourceLineNo">388</span>   * empty. If no lists at all are provided (an empty list), the resulting<a name="line.388"></a>
<span class="sourceLineNo">389</span>   * Cartesian product has one element, an empty list (counter-intuitive, but<a name="line.389"></a>
<span class="sourceLineNo">390</span>   * mathematically consistent).<a name="line.390"></a>
<span class="sourceLineNo">391</span>   *<a name="line.391"></a>
<span class="sourceLineNo">392</span>   * &lt;p&gt;&lt;i&gt;Performance notes:&lt;/i&gt; while the cartesian product of lists of size<a name="line.392"></a>
<span class="sourceLineNo">393</span>   * {@code m, n, p} is a list of size {@code m x n x p}, its actual memory<a name="line.393"></a>
<span class="sourceLineNo">394</span>   * consumption is much smaller. When the cartesian product is constructed, the<a name="line.394"></a>
<span class="sourceLineNo">395</span>   * input lists are merely copied. Only as the resulting list is iterated are<a name="line.395"></a>
<span class="sourceLineNo">396</span>   * the individual lists created, and these are not retained after iteration.<a name="line.396"></a>
<span class="sourceLineNo">397</span>   *<a name="line.397"></a>
<span class="sourceLineNo">398</span>   * @param lists the lists to choose elements from, in the order that<a name="line.398"></a>
<span class="sourceLineNo">399</span>   *     the elements chosen from those lists should appear in the resulting<a name="line.399"></a>
<span class="sourceLineNo">400</span>   *     lists<a name="line.400"></a>
<span class="sourceLineNo">401</span>   * @param &lt;B&gt; any common base class shared by all axes (often just {@link<a name="line.401"></a>
<span class="sourceLineNo">402</span>   *     Object})<a name="line.402"></a>
<span class="sourceLineNo">403</span>   * @return the Cartesian product, as an immutable list containing immutable<a name="line.403"></a>
<span class="sourceLineNo">404</span>   *     lists<a name="line.404"></a>
<span class="sourceLineNo">405</span>   * @throws IllegalArgumentException if the size of the cartesian product would<a name="line.405"></a>
<span class="sourceLineNo">406</span>   *     be greater than {@link Integer#MAX_VALUE}<a name="line.406"></a>
<span class="sourceLineNo">407</span>   * @throws NullPointerException if {@code lists}, any one of the {@code lists},<a name="line.407"></a>
<span class="sourceLineNo">408</span>   *     or any element of a provided list is null<a name="line.408"></a>
<span class="sourceLineNo">409</span>   */<a name="line.409"></a>
<span class="sourceLineNo">410</span>  static &lt;B&gt; List&lt;List&lt;B&gt;&gt; cartesianProduct(<a name="line.410"></a>
<span class="sourceLineNo">411</span>      List&lt;? extends List&lt;? extends B&gt;&gt; lists) {<a name="line.411"></a>
<span class="sourceLineNo">412</span>    return CartesianList.create(lists);<a name="line.412"></a>
<span class="sourceLineNo">413</span>  }<a name="line.413"></a>
<span class="sourceLineNo">414</span><a name="line.414"></a>
<span class="sourceLineNo">415</span>  /**<a name="line.415"></a>
<span class="sourceLineNo">416</span>   * Returns every possible list that can be formed by choosing one element<a name="line.416"></a>
<span class="sourceLineNo">417</span>   * from each of the given lists in order; the "n-ary<a name="line.417"></a>
<span class="sourceLineNo">418</span>   * &lt;a href="http://en.wikipedia.org/wiki/Cartesian_product"&gt;Cartesian<a name="line.418"></a>
<span class="sourceLineNo">419</span>   * product&lt;/a&gt;" of the lists. For example: &lt;pre&gt;   {@code<a name="line.419"></a>
<span class="sourceLineNo">420</span>   *<a name="line.420"></a>
<span class="sourceLineNo">421</span>   *   Lists.cartesianProduct(ImmutableList.of(<a name="line.421"></a>
<span class="sourceLineNo">422</span>   *       ImmutableList.of(1, 2),<a name="line.422"></a>
<span class="sourceLineNo">423</span>   *       ImmutableList.of("A", "B", "C")))}&lt;/pre&gt;<a name="line.423"></a>
<span class="sourceLineNo">424</span>   *<a name="line.424"></a>
<span class="sourceLineNo">425</span>   * returns a list containing six lists in the following order:<a name="line.425"></a>
<span class="sourceLineNo">426</span>   *<a name="line.426"></a>
<span class="sourceLineNo">427</span>   * &lt;ul&gt;<a name="line.427"></a>
<span class="sourceLineNo">428</span>   * &lt;li&gt;{@code ImmutableList.of(1, "A")}<a name="line.428"></a>
<span class="sourceLineNo">429</span>   * &lt;li&gt;{@code ImmutableList.of(1, "B")}<a name="line.429"></a>
<span class="sourceLineNo">430</span>   * &lt;li&gt;{@code ImmutableList.of(1, "C")}<a name="line.430"></a>
<span class="sourceLineNo">431</span>   * &lt;li&gt;{@code ImmutableList.of(2, "A")}<a name="line.431"></a>
<span class="sourceLineNo">432</span>   * &lt;li&gt;{@code ImmutableList.of(2, "B")}<a name="line.432"></a>
<span class="sourceLineNo">433</span>   * &lt;li&gt;{@code ImmutableList.of(2, "C")}<a name="line.433"></a>
<span class="sourceLineNo">434</span>   * &lt;/ul&gt;<a name="line.434"></a>
<span class="sourceLineNo">435</span>   *<a name="line.435"></a>
<span class="sourceLineNo">436</span>   * The result is guaranteed to be in the "traditional", lexicographical<a name="line.436"></a>
<span class="sourceLineNo">437</span>   * order for Cartesian products that you would get from nesting for loops:<a name="line.437"></a>
<span class="sourceLineNo">438</span>   * &lt;pre&gt;   {@code<a name="line.438"></a>
<span class="sourceLineNo">439</span>   *<a name="line.439"></a>
<span class="sourceLineNo">440</span>   *   for (B b0 : lists.get(0)) {<a name="line.440"></a>
<span class="sourceLineNo">441</span>   *     for (B b1 : lists.get(1)) {<a name="line.441"></a>
<span class="sourceLineNo">442</span>   *       ...<a name="line.442"></a>
<span class="sourceLineNo">443</span>   *       ImmutableList&lt;B&gt; tuple = ImmutableList.of(b0, b1, ...);<a name="line.443"></a>
<span class="sourceLineNo">444</span>   *       // operate on tuple<a name="line.444"></a>
<span class="sourceLineNo">445</span>   *     }<a name="line.445"></a>
<span class="sourceLineNo">446</span>   *   }}&lt;/pre&gt;<a name="line.446"></a>
<span class="sourceLineNo">447</span>   *<a name="line.447"></a>
<span class="sourceLineNo">448</span>   * Note that if any input list is empty, the Cartesian product will also be<a name="line.448"></a>
<span class="sourceLineNo">449</span>   * empty. If no lists at all are provided (an empty list), the resulting<a name="line.449"></a>
<span class="sourceLineNo">450</span>   * Cartesian product has one element, an empty list (counter-intuitive, but<a name="line.450"></a>
<span class="sourceLineNo">451</span>   * mathematically consistent).<a name="line.451"></a>
<span class="sourceLineNo">452</span>   *<a name="line.452"></a>
<span class="sourceLineNo">453</span>   * &lt;p&gt;&lt;i&gt;Performance notes:&lt;/i&gt; while the cartesian product of lists of size<a name="line.453"></a>
<span class="sourceLineNo">454</span>   * {@code m, n, p} is a list of size {@code m x n x p}, its actual memory<a name="line.454"></a>
<span class="sourceLineNo">455</span>   * consumption is much smaller. When the cartesian product is constructed, the<a name="line.455"></a>
<span class="sourceLineNo">456</span>   * input lists are merely copied. Only as the resulting list is iterated are<a name="line.456"></a>
<span class="sourceLineNo">457</span>   * the individual lists created, and these are not retained after iteration.<a name="line.457"></a>
<span class="sourceLineNo">458</span>   *<a name="line.458"></a>
<span class="sourceLineNo">459</span>   * @param lists the lists to choose elements from, in the order that<a name="line.459"></a>
<span class="sourceLineNo">460</span>   *     the elements chosen from those lists should appear in the resulting<a name="line.460"></a>
<span class="sourceLineNo">461</span>   *     lists<a name="line.461"></a>
<span class="sourceLineNo">462</span>   * @param &lt;B&gt; any common base class shared by all axes (often just {@link<a name="line.462"></a>
<span class="sourceLineNo">463</span>   *     Object})<a name="line.463"></a>
<span class="sourceLineNo">464</span>   * @return the Cartesian product, as an immutable list containing immutable<a name="line.464"></a>
<span class="sourceLineNo">465</span>   *     lists<a name="line.465"></a>
<span class="sourceLineNo">466</span>   * @throws IllegalArgumentException if the size of the cartesian product would<a name="line.466"></a>
<span class="sourceLineNo">467</span>   *     be greater than {@link Integer#MAX_VALUE}<a name="line.467"></a>
<span class="sourceLineNo">468</span>   * @throws NullPointerException if {@code lists}, any one of the<a name="line.468"></a>
<span class="sourceLineNo">469</span>   *     {@code lists}, or any element of a provided list is null<a name="line.469"></a>
<span class="sourceLineNo">470</span>   */<a name="line.470"></a>
<span class="sourceLineNo">471</span>  static &lt;B&gt; List&lt;List&lt;B&gt;&gt; cartesianProduct(List&lt;? extends B&gt;... lists) {<a name="line.471"></a>
<span class="sourceLineNo">472</span>    return cartesianProduct(Arrays.asList(lists));<a name="line.472"></a>
<span class="sourceLineNo">473</span>  }<a name="line.473"></a>
<span class="sourceLineNo">474</span><a name="line.474"></a>
<span class="sourceLineNo">475</span>  /**<a name="line.475"></a>
<span class="sourceLineNo">476</span>   * Returns a list that applies {@code function} to each element of {@code<a name="line.476"></a>
<span class="sourceLineNo">477</span>   * fromList}. The returned list is a transformed view of {@code fromList};<a name="line.477"></a>
<span class="sourceLineNo">478</span>   * changes to {@code fromList} will be reflected in the returned list and vice<a name="line.478"></a>
<span class="sourceLineNo">479</span>   * versa.<a name="line.479"></a>
<span class="sourceLineNo">480</span>   *<a name="line.480"></a>
<span class="sourceLineNo">481</span>   * &lt;p&gt;Since functions are not reversible, the transform is one-way and new<a name="line.481"></a>
<span class="sourceLineNo">482</span>   * items cannot be stored in the returned list. The {@code add},<a name="line.482"></a>
<span class="sourceLineNo">483</span>   * {@code addAll} and {@code set} methods are unsupported in the returned<a name="line.483"></a>
<span class="sourceLineNo">484</span>   * list.<a name="line.484"></a>
<span class="sourceLineNo">485</span>   *<a name="line.485"></a>
<span class="sourceLineNo">486</span>   * &lt;p&gt;The function is applied lazily, invoked when needed. This is necessary<a name="line.486"></a>
<span class="sourceLineNo">487</span>   * for the returned list to be a view, but it means that the function will be<a name="line.487"></a>
<span class="sourceLineNo">488</span>   * applied many times for bulk operations like {@link List#contains} and<a name="line.488"></a>
<span class="sourceLineNo">489</span>   * {@link List#hashCode}. For this to perform well, {@code function} should be<a name="line.489"></a>
<span class="sourceLineNo">490</span>   * fast. To avoid lazy evaluation when the returned list doesn't need to be a<a name="line.490"></a>
<span class="sourceLineNo">491</span>   * view, copy the returned list into a new list of your choosing.<a name="line.491"></a>
<span class="sourceLineNo">492</span>   *<a name="line.492"></a>
<span class="sourceLineNo">493</span>   * &lt;p&gt;If {@code fromList} implements {@link RandomAccess}, so will the<a name="line.493"></a>
<span class="sourceLineNo">494</span>   * returned list. The returned list is threadsafe if the supplied list and<a name="line.494"></a>
<span class="sourceLineNo">495</span>   * function are.<a name="line.495"></a>
<span class="sourceLineNo">496</span>   *<a name="line.496"></a>
<span class="sourceLineNo">497</span>   * &lt;p&gt;If only a {@code Collection} or {@code Iterable} input is available, use<a name="line.497"></a>
<span class="sourceLineNo">498</span>   * {@link Collections2#transform} or {@link Iterables#transform}.<a name="line.498"></a>
<span class="sourceLineNo">499</span>   *<a name="line.499"></a>
<span class="sourceLineNo">500</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; serializing the returned list is implemented by serializing<a name="line.500"></a>
<span class="sourceLineNo">501</span>   * {@code fromList}, its contents, and {@code function} -- &lt;i&gt;not&lt;/i&gt; by<a name="line.501"></a>
<span class="sourceLineNo">502</span>   * serializing the transformed values. This can lead to surprising behavior,<a name="line.502"></a>
<span class="sourceLineNo">503</span>   * so serializing the returned list is &lt;b&gt;not recommended&lt;/b&gt;. Instead,<a name="line.503"></a>
<span class="sourceLineNo">504</span>   * copy the list using {@link ImmutableList#copyOf(Collection)} (for example),<a name="line.504"></a>
<span class="sourceLineNo">505</span>   * then serialize the copy. Other methods similar to this do not implement<a name="line.505"></a>
<span class="sourceLineNo">506</span>   * serialization at all for this reason.<a name="line.506"></a>
<span class="sourceLineNo">507</span>   */<a name="line.507"></a>
<span class="sourceLineNo">508</span>  public static &lt;F, T&gt; List&lt;T&gt; transform(<a name="line.508"></a>
<span class="sourceLineNo">509</span>      List&lt;F&gt; fromList, Function&lt;? super F, ? extends T&gt; function) {<a name="line.509"></a>
<span class="sourceLineNo">510</span>    return (fromList instanceof RandomAccess)<a name="line.510"></a>
<span class="sourceLineNo">511</span>        ? new TransformingRandomAccessList&lt;F, T&gt;(fromList, function)<a name="line.511"></a>
<span class="sourceLineNo">512</span>        : new TransformingSequentialList&lt;F, T&gt;(fromList, function);<a name="line.512"></a>
<span class="sourceLineNo">513</span>  }<a name="line.513"></a>
<span class="sourceLineNo">514</span><a name="line.514"></a>
<span class="sourceLineNo">515</span>  /**<a name="line.515"></a>
<span class="sourceLineNo">516</span>   * Implementation of a sequential transforming list.<a name="line.516"></a>
<span class="sourceLineNo">517</span>   *<a name="line.517"></a>
<span class="sourceLineNo">518</span>   * @see Lists#transform<a name="line.518"></a>
<span class="sourceLineNo">519</span>   */<a name="line.519"></a>
<span class="sourceLineNo">520</span>  private static class TransformingSequentialList&lt;F, T&gt;<a name="line.520"></a>
<span class="sourceLineNo">521</span>      extends AbstractSequentialList&lt;T&gt; implements Serializable {<a name="line.521"></a>
<span class="sourceLineNo">522</span>    final List&lt;F&gt; fromList;<a name="line.522"></a>
<span class="sourceLineNo">523</span>    final Function&lt;? super F, ? extends T&gt; function;<a name="line.523"></a>
<span class="sourceLineNo">524</span><a name="line.524"></a>
<span class="sourceLineNo">525</span>    TransformingSequentialList(<a name="line.525"></a>
<span class="sourceLineNo">526</span>        List&lt;F&gt; fromList, Function&lt;? super F, ? extends T&gt; function) {<a name="line.526"></a>
<span class="sourceLineNo">527</span>      this.fromList = checkNotNull(fromList);<a name="line.527"></a>
<span class="sourceLineNo">528</span>      this.function = checkNotNull(function);<a name="line.528"></a>
<span class="sourceLineNo">529</span>    }<a name="line.529"></a>
<span class="sourceLineNo">530</span>    /**<a name="line.530"></a>
<span class="sourceLineNo">531</span>     * The default implementation inherited is based on iteration and removal of<a name="line.531"></a>
<span class="sourceLineNo">532</span>     * each element which can be overkill. That's why we forward this call<a name="line.532"></a>
<span class="sourceLineNo">533</span>     * directly to the backing list.<a name="line.533"></a>
<span class="sourceLineNo">534</span>     */<a name="line.534"></a>
<span class="sourceLineNo">535</span>    @Override public void clear() {<a name="line.535"></a>
<span class="sourceLineNo">536</span>      fromList.clear();<a name="line.536"></a>
<span class="sourceLineNo">537</span>    }<a name="line.537"></a>
<span class="sourceLineNo">538</span>    @Override public int size() {<a name="line.538"></a>
<span class="sourceLineNo">539</span>      return fromList.size();<a name="line.539"></a>
<span class="sourceLineNo">540</span>    }<a name="line.540"></a>
<span class="sourceLineNo">541</span>    @Override public ListIterator&lt;T&gt; listIterator(final int index) {<a name="line.541"></a>
<span class="sourceLineNo">542</span>      return new TransformedListIterator&lt;F, T&gt;(fromList.listIterator(index)) {<a name="line.542"></a>
<span class="sourceLineNo">543</span>        @Override<a name="line.543"></a>
<span class="sourceLineNo">544</span>        T transform(F from) {<a name="line.544"></a>
<span class="sourceLineNo">545</span>          return function.apply(from);<a name="line.545"></a>
<span class="sourceLineNo">546</span>        }<a name="line.546"></a>
<span class="sourceLineNo">547</span>      };<a name="line.547"></a>
<span class="sourceLineNo">548</span>    }<a name="line.548"></a>
<span class="sourceLineNo">549</span><a name="line.549"></a>
<span class="sourceLineNo">550</span>    private static final long serialVersionUID = 0;<a name="line.550"></a>
<span class="sourceLineNo">551</span>  }<a name="line.551"></a>
<span class="sourceLineNo">552</span><a name="line.552"></a>
<span class="sourceLineNo">553</span>  /**<a name="line.553"></a>
<span class="sourceLineNo">554</span>   * Implementation of a transforming random access list. We try to make as many<a name="line.554"></a>
<span class="sourceLineNo">555</span>   * of these methods pass-through to the source list as possible so that the<a name="line.555"></a>
<span class="sourceLineNo">556</span>   * performance characteristics of the source list and transformed list are<a name="line.556"></a>
<span class="sourceLineNo">557</span>   * similar.<a name="line.557"></a>
<span class="sourceLineNo">558</span>   *<a name="line.558"></a>
<span class="sourceLineNo">559</span>   * @see Lists#transform<a name="line.559"></a>
<span class="sourceLineNo">560</span>   */<a name="line.560"></a>
<span class="sourceLineNo">561</span>  private static class TransformingRandomAccessList&lt;F, T&gt;<a name="line.561"></a>
<span class="sourceLineNo">562</span>      extends AbstractList&lt;T&gt; implements RandomAccess, Serializable {<a name="line.562"></a>
<span class="sourceLineNo">563</span>    final List&lt;F&gt; fromList;<a name="line.563"></a>
<span class="sourceLineNo">564</span>    final Function&lt;? super F, ? extends T&gt; function;<a name="line.564"></a>
<span class="sourceLineNo">565</span><a name="line.565"></a>
<span class="sourceLineNo">566</span>    TransformingRandomAccessList(<a name="line.566"></a>
<span class="sourceLineNo">567</span>        List&lt;F&gt; fromList, Function&lt;? super F, ? extends T&gt; function) {<a name="line.567"></a>
<span class="sourceLineNo">568</span>      this.fromList = checkNotNull(fromList);<a name="line.568"></a>
<span class="sourceLineNo">569</span>      this.function = checkNotNull(function);<a name="line.569"></a>
<span class="sourceLineNo">570</span>    }<a name="line.570"></a>
<span class="sourceLineNo">571</span>    @Override public void clear() {<a name="line.571"></a>
<span class="sourceLineNo">572</span>      fromList.clear();<a name="line.572"></a>
<span class="sourceLineNo">573</span>    }<a name="line.573"></a>
<span class="sourceLineNo">574</span>    @Override public T get(int index) {<a name="line.574"></a>
<span class="sourceLineNo">575</span>      return function.apply(fromList.get(index));<a name="line.575"></a>
<span class="sourceLineNo">576</span>    }<a name="line.576"></a>
<span class="sourceLineNo">577</span>    @Override public boolean isEmpty() {<a name="line.577"></a>
<span class="sourceLineNo">578</span>      return fromList.isEmpty();<a name="line.578"></a>
<span class="sourceLineNo">579</span>    }<a name="line.579"></a>
<span class="sourceLineNo">580</span>    @Override public T remove(int index) {<a name="line.580"></a>
<span class="sourceLineNo">581</span>      return function.apply(fromList.remove(index));<a name="line.581"></a>
<span class="sourceLineNo">582</span>    }<a name="line.582"></a>
<span class="sourceLineNo">583</span>    @Override public int size() {<a name="line.583"></a>
<span class="sourceLineNo">584</span>      return fromList.size();<a name="line.584"></a>
<span class="sourceLineNo">585</span>    }<a name="line.585"></a>
<span class="sourceLineNo">586</span>    private static final long serialVersionUID = 0;<a name="line.586"></a>
<span class="sourceLineNo">587</span>  }<a name="line.587"></a>
<span class="sourceLineNo">588</span><a name="line.588"></a>
<span class="sourceLineNo">589</span>  /**<a name="line.589"></a>
<span class="sourceLineNo">590</span>   * Returns consecutive {@linkplain List#subList(int, int) sublists} of a list,<a name="line.590"></a>
<span class="sourceLineNo">591</span>   * each of the same size (the final list may be smaller). For example,<a name="line.591"></a>
<span class="sourceLineNo">592</span>   * partitioning a list containing {@code [a, b, c, d, e]} with a partition<a name="line.592"></a>
<span class="sourceLineNo">593</span>   * size of 3 yields {@code [[a, b, c], [d, e]]} -- an outer list containing<a name="line.593"></a>
<span class="sourceLineNo">594</span>   * two inner lists of three and two elements, all in the original order.<a name="line.594"></a>
<span class="sourceLineNo">595</span>   *<a name="line.595"></a>
<span class="sourceLineNo">596</span>   * &lt;p&gt;The outer list is unmodifiable, but reflects the latest state of the<a name="line.596"></a>
<span class="sourceLineNo">597</span>   * source list. The inner lists are sublist views of the original list,<a name="line.597"></a>
<span class="sourceLineNo">598</span>   * produced on demand using {@link List#subList(int, int)}, and are subject<a name="line.598"></a>
<span class="sourceLineNo">599</span>   * to all the usual caveats about modification as explained in that API.<a name="line.599"></a>
<span class="sourceLineNo">600</span>   *<a name="line.600"></a>
<span class="sourceLineNo">601</span>   * @param list the list to return consecutive sublists of<a name="line.601"></a>
<span class="sourceLineNo">602</span>   * @param size the desired size of each sublist (the last may be<a name="line.602"></a>
<span class="sourceLineNo">603</span>   *     smaller)<a name="line.603"></a>
<span class="sourceLineNo">604</span>   * @return a list of consecutive sublists<a name="line.604"></a>
<span class="sourceLineNo">605</span>   * @throws IllegalArgumentException if {@code partitionSize} is nonpositive<a name="line.605"></a>
<span class="sourceLineNo">606</span>   */<a name="line.606"></a>
<span class="sourceLineNo">607</span>  public static &lt;T&gt; List&lt;List&lt;T&gt;&gt; partition(List&lt;T&gt; list, int size) {<a name="line.607"></a>
<span class="sourceLineNo">608</span>    checkNotNull(list);<a name="line.608"></a>
<span class="sourceLineNo">609</span>    checkArgument(size &gt; 0);<a name="line.609"></a>
<span class="sourceLineNo">610</span>    return (list instanceof RandomAccess)<a name="line.610"></a>
<span class="sourceLineNo">611</span>        ? new RandomAccessPartition&lt;T&gt;(list, size)<a name="line.611"></a>
<span class="sourceLineNo">612</span>        : new Partition&lt;T&gt;(list, size);<a name="line.612"></a>
<span class="sourceLineNo">613</span>  }<a name="line.613"></a>
<span class="sourceLineNo">614</span><a name="line.614"></a>
<span class="sourceLineNo">615</span>  private static class Partition&lt;T&gt; extends AbstractList&lt;List&lt;T&gt;&gt; {<a name="line.615"></a>
<span class="sourceLineNo">616</span>    final List&lt;T&gt; list;<a name="line.616"></a>
<span class="sourceLineNo">617</span>    final int size;<a name="line.617"></a>
<span class="sourceLineNo">618</span><a name="line.618"></a>
<span class="sourceLineNo">619</span>    Partition(List&lt;T&gt; list, int size) {<a name="line.619"></a>
<span class="sourceLineNo">620</span>      this.list = list;<a name="line.620"></a>
<span class="sourceLineNo">621</span>      this.size = size;<a name="line.621"></a>
<span class="sourceLineNo">622</span>    }<a name="line.622"></a>
<span class="sourceLineNo">623</span><a name="line.623"></a>
<span class="sourceLineNo">624</span>    @Override public List&lt;T&gt; get(int index) {<a name="line.624"></a>
<span class="sourceLineNo">625</span>      int listSize = size();<a name="line.625"></a>
<span class="sourceLineNo">626</span>      checkElementIndex(index, listSize);<a name="line.626"></a>
<span class="sourceLineNo">627</span>      int start = index * size;<a name="line.627"></a>
<span class="sourceLineNo">628</span>      int end = Math.min(start + size, list.size());<a name="line.628"></a>
<span class="sourceLineNo">629</span>      return list.subList(start, end);<a name="line.629"></a>
<span class="sourceLineNo">630</span>    }<a name="line.630"></a>
<span class="sourceLineNo">631</span><a name="line.631"></a>
<span class="sourceLineNo">632</span>    @Override public int size() {<a name="line.632"></a>
<span class="sourceLineNo">633</span>      // TODO(user): refactor to common.math.IntMath.divide<a name="line.633"></a>
<span class="sourceLineNo">634</span>      int result = list.size() / size;<a name="line.634"></a>
<span class="sourceLineNo">635</span>      if (result * size != list.size()) {<a name="line.635"></a>
<span class="sourceLineNo">636</span>        result++;<a name="line.636"></a>
<span class="sourceLineNo">637</span>      }<a name="line.637"></a>
<span class="sourceLineNo">638</span>      return result;<a name="line.638"></a>
<span class="sourceLineNo">639</span>    }<a name="line.639"></a>
<span class="sourceLineNo">640</span><a name="line.640"></a>
<span class="sourceLineNo">641</span>    @Override public boolean isEmpty() {<a name="line.641"></a>
<span class="sourceLineNo">642</span>      return list.isEmpty();<a name="line.642"></a>
<span class="sourceLineNo">643</span>    }<a name="line.643"></a>
<span class="sourceLineNo">644</span>  }<a name="line.644"></a>
<span class="sourceLineNo">645</span><a name="line.645"></a>
<span class="sourceLineNo">646</span>  private static class RandomAccessPartition&lt;T&gt; extends Partition&lt;T&gt;<a name="line.646"></a>
<span class="sourceLineNo">647</span>      implements RandomAccess {<a name="line.647"></a>
<span class="sourceLineNo">648</span>    RandomAccessPartition(List&lt;T&gt; list, int size) {<a name="line.648"></a>
<span class="sourceLineNo">649</span>      super(list, size);<a name="line.649"></a>
<span class="sourceLineNo">650</span>    }<a name="line.650"></a>
<span class="sourceLineNo">651</span>  }<a name="line.651"></a>
<span class="sourceLineNo">652</span><a name="line.652"></a>
<span class="sourceLineNo">653</span>  /**<a name="line.653"></a>
<span class="sourceLineNo">654</span>   * Returns a view of the specified string as an immutable list of {@code<a name="line.654"></a>
<span class="sourceLineNo">655</span>   * Character} values.<a name="line.655"></a>
<span class="sourceLineNo">656</span>   *<a name="line.656"></a>
<span class="sourceLineNo">657</span>   * @since 7.0<a name="line.657"></a>
<span class="sourceLineNo">658</span>   */<a name="line.658"></a>
<span class="sourceLineNo">659</span>  @Beta public static ImmutableList&lt;Character&gt; charactersOf(String string) {<a name="line.659"></a>
<span class="sourceLineNo">660</span>    return new StringAsImmutableList(checkNotNull(string));<a name="line.660"></a>
<span class="sourceLineNo">661</span>  }<a name="line.661"></a>
<span class="sourceLineNo">662</span><a name="line.662"></a>
<span class="sourceLineNo">663</span>  @SuppressWarnings("serial") // serialized using ImmutableList serialization<a name="line.663"></a>
<span class="sourceLineNo">664</span>  private static final class StringAsImmutableList<a name="line.664"></a>
<span class="sourceLineNo">665</span>      extends ImmutableList&lt;Character&gt; {<a name="line.665"></a>
<span class="sourceLineNo">666</span><a name="line.666"></a>
<span class="sourceLineNo">667</span>    private final String string;<a name="line.667"></a>
<span class="sourceLineNo">668</span><a name="line.668"></a>
<span class="sourceLineNo">669</span>    StringAsImmutableList(String string) {<a name="line.669"></a>
<span class="sourceLineNo">670</span>      this.string = string;<a name="line.670"></a>
<span class="sourceLineNo">671</span>    }<a name="line.671"></a>
<span class="sourceLineNo">672</span><a name="line.672"></a>
<span class="sourceLineNo">673</span>    @Override public int indexOf(@Nullable Object object) {<a name="line.673"></a>
<span class="sourceLineNo">674</span>      return (object instanceof Character)<a name="line.674"></a>
<span class="sourceLineNo">675</span>          ? string.indexOf((Character) object) : -1;<a name="line.675"></a>
<span class="sourceLineNo">676</span>    }<a name="line.676"></a>
<span class="sourceLineNo">677</span><a name="line.677"></a>
<span class="sourceLineNo">678</span>    @Override public int lastIndexOf(@Nullable Object object) {<a name="line.678"></a>
<span class="sourceLineNo">679</span>      return (object instanceof Character)<a name="line.679"></a>
<span class="sourceLineNo">680</span>          ? string.lastIndexOf((Character) object) : -1;<a name="line.680"></a>
<span class="sourceLineNo">681</span>    }<a name="line.681"></a>
<span class="sourceLineNo">682</span><a name="line.682"></a>
<span class="sourceLineNo">683</span>    @Override public ImmutableList&lt;Character&gt; subList(<a name="line.683"></a>
<span class="sourceLineNo">684</span>        int fromIndex, int toIndex) {<a name="line.684"></a>
<span class="sourceLineNo">685</span>      checkPositionIndexes(fromIndex, toIndex, size()); // for GWT<a name="line.685"></a>
<span class="sourceLineNo">686</span>      return charactersOf(string.substring(fromIndex, toIndex));<a name="line.686"></a>
<span class="sourceLineNo">687</span>    }<a name="line.687"></a>
<span class="sourceLineNo">688</span><a name="line.688"></a>
<span class="sourceLineNo">689</span>    @Override boolean isPartialView() {<a name="line.689"></a>
<span class="sourceLineNo">690</span>      return false;<a name="line.690"></a>
<span class="sourceLineNo">691</span>    }<a name="line.691"></a>
<span class="sourceLineNo">692</span><a name="line.692"></a>
<span class="sourceLineNo">693</span>    @Override public Character get(int index) {<a name="line.693"></a>
<span class="sourceLineNo">694</span>      checkElementIndex(index, size()); // for GWT<a name="line.694"></a>
<span class="sourceLineNo">695</span>      return string.charAt(index);<a name="line.695"></a>
<span class="sourceLineNo">696</span>    }<a name="line.696"></a>
<span class="sourceLineNo">697</span><a name="line.697"></a>
<span class="sourceLineNo">698</span>    @Override public int size() {<a name="line.698"></a>
<span class="sourceLineNo">699</span>      return string.length();<a name="line.699"></a>
<span class="sourceLineNo">700</span>    }<a name="line.700"></a>
<span class="sourceLineNo">701</span><a name="line.701"></a>
<span class="sourceLineNo">702</span>    @Override public boolean equals(@Nullable Object obj) {<a name="line.702"></a>
<span class="sourceLineNo">703</span>      if (!(obj instanceof List)) {<a name="line.703"></a>
<span class="sourceLineNo">704</span>        return false;<a name="line.704"></a>
<span class="sourceLineNo">705</span>      }<a name="line.705"></a>
<span class="sourceLineNo">706</span>      List&lt;?&gt; list = (List&lt;?&gt;) obj;<a name="line.706"></a>
<span class="sourceLineNo">707</span>      int n = string.length();<a name="line.707"></a>
<span class="sourceLineNo">708</span>      if (n != list.size()) {<a name="line.708"></a>
<span class="sourceLineNo">709</span>        return false;<a name="line.709"></a>
<span class="sourceLineNo">710</span>      }<a name="line.710"></a>
<span class="sourceLineNo">711</span>      Iterator&lt;?&gt; iterator = list.iterator();<a name="line.711"></a>
<span class="sourceLineNo">712</span>      for (int i = 0; i &lt; n; i++) {<a name="line.712"></a>
<span class="sourceLineNo">713</span>        Object elem = iterator.next();<a name="line.713"></a>
<span class="sourceLineNo">714</span>        if (!(elem instanceof Character)<a name="line.714"></a>
<span class="sourceLineNo">715</span>            || ((Character) elem).charValue() != string.charAt(i)) {<a name="line.715"></a>
<span class="sourceLineNo">716</span>          return false;<a name="line.716"></a>
<span class="sourceLineNo">717</span>        }<a name="line.717"></a>
<span class="sourceLineNo">718</span>      }<a name="line.718"></a>
<span class="sourceLineNo">719</span>      return true;<a name="line.719"></a>
<span class="sourceLineNo">720</span>    }<a name="line.720"></a>
<span class="sourceLineNo">721</span><a name="line.721"></a>
<span class="sourceLineNo">722</span>    int hash = 0;<a name="line.722"></a>
<span class="sourceLineNo">723</span><a name="line.723"></a>
<span class="sourceLineNo">724</span>    @Override public int hashCode() {<a name="line.724"></a>
<span class="sourceLineNo">725</span>      int h = hash;<a name="line.725"></a>
<span class="sourceLineNo">726</span>      if (h == 0) {<a name="line.726"></a>
<span class="sourceLineNo">727</span>        h = 1;<a name="line.727"></a>
<span class="sourceLineNo">728</span>        for (int i = 0; i &lt; string.length(); i++) {<a name="line.728"></a>
<span class="sourceLineNo">729</span>          h = h * 31 + string.charAt(i);<a name="line.729"></a>
<span class="sourceLineNo">730</span>        }<a name="line.730"></a>
<span class="sourceLineNo">731</span>        hash = h;<a name="line.731"></a>
<span class="sourceLineNo">732</span>      }<a name="line.732"></a>
<span class="sourceLineNo">733</span>      return h;<a name="line.733"></a>
<span class="sourceLineNo">734</span>    }<a name="line.734"></a>
<span class="sourceLineNo">735</span>  }<a name="line.735"></a>
<span class="sourceLineNo">736</span><a name="line.736"></a>
<span class="sourceLineNo">737</span>  /**<a name="line.737"></a>
<span class="sourceLineNo">738</span>   * Returns a view of the specified {@code CharSequence} as a {@code<a name="line.738"></a>
<span class="sourceLineNo">739</span>   * List&lt;Character&gt;}, viewing {@code sequence} as a sequence of Unicode code<a name="line.739"></a>
<span class="sourceLineNo">740</span>   * units. The view does not support any modification operations, but reflects<a name="line.740"></a>
<span class="sourceLineNo">741</span>   * any changes to the underlying character sequence.<a name="line.741"></a>
<span class="sourceLineNo">742</span>   *<a name="line.742"></a>
<span class="sourceLineNo">743</span>   * @param sequence the character sequence to view as a {@code List} of<a name="line.743"></a>
<span class="sourceLineNo">744</span>   *        characters<a name="line.744"></a>
<span class="sourceLineNo">745</span>   * @return an {@code List&lt;Character&gt;} view of the character sequence<a name="line.745"></a>
<span class="sourceLineNo">746</span>   * @since 7.0<a name="line.746"></a>
<span class="sourceLineNo">747</span>   */<a name="line.747"></a>
<span class="sourceLineNo">748</span>  @Beta public static List&lt;Character&gt; charactersOf(CharSequence sequence) {<a name="line.748"></a>
<span class="sourceLineNo">749</span>    return new CharSequenceAsList(checkNotNull(sequence));<a name="line.749"></a>
<span class="sourceLineNo">750</span>  }<a name="line.750"></a>
<span class="sourceLineNo">751</span><a name="line.751"></a>
<span class="sourceLineNo">752</span>  private static final class CharSequenceAsList<a name="line.752"></a>
<span class="sourceLineNo">753</span>      extends AbstractList&lt;Character&gt; {<a name="line.753"></a>
<span class="sourceLineNo">754</span>    private final CharSequence sequence;<a name="line.754"></a>
<span class="sourceLineNo">755</span><a name="line.755"></a>
<span class="sourceLineNo">756</span>    CharSequenceAsList(CharSequence sequence) {<a name="line.756"></a>
<span class="sourceLineNo">757</span>      this.sequence = sequence;<a name="line.757"></a>
<span class="sourceLineNo">758</span>    }<a name="line.758"></a>
<span class="sourceLineNo">759</span><a name="line.759"></a>
<span class="sourceLineNo">760</span>    @Override public Character get(int index) {<a name="line.760"></a>
<span class="sourceLineNo">761</span>      checkElementIndex(index, size()); // for GWT<a name="line.761"></a>
<span class="sourceLineNo">762</span>      return sequence.charAt(index);<a name="line.762"></a>
<span class="sourceLineNo">763</span>    }<a name="line.763"></a>
<span class="sourceLineNo">764</span><a name="line.764"></a>
<span class="sourceLineNo">765</span>    @Override public boolean contains(@Nullable Object o) {<a name="line.765"></a>
<span class="sourceLineNo">766</span>      return indexOf(o) &gt;= 0;<a name="line.766"></a>
<span class="sourceLineNo">767</span>    }<a name="line.767"></a>
<span class="sourceLineNo">768</span><a name="line.768"></a>
<span class="sourceLineNo">769</span>    @Override public int indexOf(@Nullable Object o) {<a name="line.769"></a>
<span class="sourceLineNo">770</span>      if (o instanceof Character) {<a name="line.770"></a>
<span class="sourceLineNo">771</span>        char c = (Character) o;<a name="line.771"></a>
<span class="sourceLineNo">772</span>        for (int i = 0; i &lt; sequence.length(); i++) {<a name="line.772"></a>
<span class="sourceLineNo">773</span>          if (sequence.charAt(i) == c) {<a name="line.773"></a>
<span class="sourceLineNo">774</span>            return i;<a name="line.774"></a>
<span class="sourceLineNo">775</span>          }<a name="line.775"></a>
<span class="sourceLineNo">776</span>        }<a name="line.776"></a>
<span class="sourceLineNo">777</span>      }<a name="line.777"></a>
<span class="sourceLineNo">778</span>      return -1;<a name="line.778"></a>
<span class="sourceLineNo">779</span>    }<a name="line.779"></a>
<span class="sourceLineNo">780</span><a name="line.780"></a>
<span class="sourceLineNo">781</span>    @Override public int lastIndexOf(@Nullable Object o) {<a name="line.781"></a>
<span class="sourceLineNo">782</span>      if (o instanceof Character) {<a name="line.782"></a>
<span class="sourceLineNo">783</span>        char c = ((Character) o).charValue();<a name="line.783"></a>
<span class="sourceLineNo">784</span>        for (int i = sequence.length() - 1; i &gt;= 0; i--) {<a name="line.784"></a>
<span class="sourceLineNo">785</span>          if (sequence.charAt(i) == c) {<a name="line.785"></a>
<span class="sourceLineNo">786</span>            return i;<a name="line.786"></a>
<span class="sourceLineNo">787</span>          }<a name="line.787"></a>
<span class="sourceLineNo">788</span>        }<a name="line.788"></a>
<span class="sourceLineNo">789</span>      }<a name="line.789"></a>
<span class="sourceLineNo">790</span>      return -1;<a name="line.790"></a>
<span class="sourceLineNo">791</span>    }<a name="line.791"></a>
<span class="sourceLineNo">792</span><a name="line.792"></a>
<span class="sourceLineNo">793</span>    @Override public int size() {<a name="line.793"></a>
<span class="sourceLineNo">794</span>      return sequence.length();<a name="line.794"></a>
<span class="sourceLineNo">795</span>    }<a name="line.795"></a>
<span class="sourceLineNo">796</span><a name="line.796"></a>
<span class="sourceLineNo">797</span>    @Override public List&lt;Character&gt; subList(int fromIndex, int toIndex) {<a name="line.797"></a>
<span class="sourceLineNo">798</span>      checkPositionIndexes(fromIndex, toIndex, size()); // for GWT<a name="line.798"></a>
<span class="sourceLineNo">799</span>      return charactersOf(sequence.subSequence(fromIndex, toIndex));<a name="line.799"></a>
<span class="sourceLineNo">800</span>    }<a name="line.800"></a>
<span class="sourceLineNo">801</span><a name="line.801"></a>
<span class="sourceLineNo">802</span>    @Override public int hashCode() {<a name="line.802"></a>
<span class="sourceLineNo">803</span>      int hash = 1;<a name="line.803"></a>
<span class="sourceLineNo">804</span>      for (int i = 0; i &lt; sequence.length(); i++) {<a name="line.804"></a>
<span class="sourceLineNo">805</span>        hash = hash * 31 + sequence.charAt(i);<a name="line.805"></a>
<span class="sourceLineNo">806</span>      }<a name="line.806"></a>
<span class="sourceLineNo">807</span>      return hash;<a name="line.807"></a>
<span class="sourceLineNo">808</span>    }<a name="line.808"></a>
<span class="sourceLineNo">809</span><a name="line.809"></a>
<span class="sourceLineNo">810</span>    @Override public boolean equals(@Nullable Object o) {<a name="line.810"></a>
<span class="sourceLineNo">811</span>      if (!(o instanceof List)) {<a name="line.811"></a>
<span class="sourceLineNo">812</span>        return false;<a name="line.812"></a>
<span class="sourceLineNo">813</span>      }<a name="line.813"></a>
<span class="sourceLineNo">814</span>      List&lt;?&gt; list = (List&lt;?&gt;) o;<a name="line.814"></a>
<span class="sourceLineNo">815</span>      int n = sequence.length();<a name="line.815"></a>
<span class="sourceLineNo">816</span>      if (n != list.size()) {<a name="line.816"></a>
<span class="sourceLineNo">817</span>        return false;<a name="line.817"></a>
<span class="sourceLineNo">818</span>      }<a name="line.818"></a>
<span class="sourceLineNo">819</span>      Iterator&lt;?&gt; iterator = list.iterator();<a name="line.819"></a>
<span class="sourceLineNo">820</span>      for (int i = 0; i &lt; n; i++) {<a name="line.820"></a>
<span class="sourceLineNo">821</span>        Object elem = iterator.next();<a name="line.821"></a>
<span class="sourceLineNo">822</span>        if (!(elem instanceof Character)<a name="line.822"></a>
<span class="sourceLineNo">823</span>            || ((Character) elem).charValue() != sequence.charAt(i)) {<a name="line.823"></a>
<span class="sourceLineNo">824</span>          return false;<a name="line.824"></a>
<span class="sourceLineNo">825</span>        }<a name="line.825"></a>
<span class="sourceLineNo">826</span>      }<a name="line.826"></a>
<span class="sourceLineNo">827</span>      return true;<a name="line.827"></a>
<span class="sourceLineNo">828</span>    }<a name="line.828"></a>
<span class="sourceLineNo">829</span>  }<a name="line.829"></a>
<span class="sourceLineNo">830</span><a name="line.830"></a>
<span class="sourceLineNo">831</span>  /**<a name="line.831"></a>
<span class="sourceLineNo">832</span>   * Returns a reversed view of the specified list. For example, {@code<a name="line.832"></a>
<span class="sourceLineNo">833</span>   * Lists.reverse(Arrays.asList(1, 2, 3))} returns a list containing {@code 3,<a name="line.833"></a>
<span class="sourceLineNo">834</span>   * 2, 1}. The returned list is backed by this list, so changes in the returned<a name="line.834"></a>
<span class="sourceLineNo">835</span>   * list are reflected in this list, and vice-versa. The returned list supports<a name="line.835"></a>
<span class="sourceLineNo">836</span>   * all of the optional list operations supported by this list.<a name="line.836"></a>
<span class="sourceLineNo">837</span>   *<a name="line.837"></a>
<span class="sourceLineNo">838</span>   * &lt;p&gt;The returned list is random-access if the specified list is random<a name="line.838"></a>
<span class="sourceLineNo">839</span>   * access.<a name="line.839"></a>
<span class="sourceLineNo">840</span>   *<a name="line.840"></a>
<span class="sourceLineNo">841</span>   * @since 7.0<a name="line.841"></a>
<span class="sourceLineNo">842</span>   */<a name="line.842"></a>
<span class="sourceLineNo">843</span>  public static &lt;T&gt; List&lt;T&gt; reverse(List&lt;T&gt; list) {<a name="line.843"></a>
<span class="sourceLineNo">844</span>    if (list instanceof ReverseList) {<a name="line.844"></a>
<span class="sourceLineNo">845</span>      return ((ReverseList&lt;T&gt;) list).getForwardList();<a name="line.845"></a>
<span class="sourceLineNo">846</span>    } else if (list instanceof RandomAccess) {<a name="line.846"></a>
<span class="sourceLineNo">847</span>      return new RandomAccessReverseList&lt;T&gt;(list);<a name="line.847"></a>
<span class="sourceLineNo">848</span>    } else {<a name="line.848"></a>
<span class="sourceLineNo">849</span>      return new ReverseList&lt;T&gt;(list);<a name="line.849"></a>
<span class="sourceLineNo">850</span>    }<a name="line.850"></a>
<span class="sourceLineNo">851</span>  }<a name="line.851"></a>
<span class="sourceLineNo">852</span><a name="line.852"></a>
<span class="sourceLineNo">853</span>  private static class ReverseList&lt;T&gt; extends AbstractList&lt;T&gt; {<a name="line.853"></a>
<span class="sourceLineNo">854</span>    private final List&lt;T&gt; forwardList;<a name="line.854"></a>
<span class="sourceLineNo">855</span><a name="line.855"></a>
<span class="sourceLineNo">856</span>    ReverseList(List&lt;T&gt; forwardList) {<a name="line.856"></a>
<span class="sourceLineNo">857</span>      this.forwardList = checkNotNull(forwardList);<a name="line.857"></a>
<span class="sourceLineNo">858</span>    }<a name="line.858"></a>
<span class="sourceLineNo">859</span><a name="line.859"></a>
<span class="sourceLineNo">860</span>    List&lt;T&gt; getForwardList() {<a name="line.860"></a>
<span class="sourceLineNo">861</span>      return forwardList;<a name="line.861"></a>
<span class="sourceLineNo">862</span>    }<a name="line.862"></a>
<span class="sourceLineNo">863</span><a name="line.863"></a>
<span class="sourceLineNo">864</span>    private int reverseIndex(int index) {<a name="line.864"></a>
<span class="sourceLineNo">865</span>      int size = size();<a name="line.865"></a>
<span class="sourceLineNo">866</span>      checkElementIndex(index, size);<a name="line.866"></a>
<span class="sourceLineNo">867</span>      return (size - 1) - index;<a name="line.867"></a>
<span class="sourceLineNo">868</span>    }<a name="line.868"></a>
<span class="sourceLineNo">869</span><a name="line.869"></a>
<span class="sourceLineNo">870</span>    private int reversePosition(int index) {<a name="line.870"></a>
<span class="sourceLineNo">871</span>      int size = size();<a name="line.871"></a>
<span class="sourceLineNo">872</span>      checkPositionIndex(index, size);<a name="line.872"></a>
<span class="sourceLineNo">873</span>      return size - index;<a name="line.873"></a>
<span class="sourceLineNo">874</span>    }<a name="line.874"></a>
<span class="sourceLineNo">875</span><a name="line.875"></a>
<span class="sourceLineNo">876</span>    @Override public void add(int index, @Nullable T element) {<a name="line.876"></a>
<span class="sourceLineNo">877</span>      forwardList.add(reversePosition(index), element);<a name="line.877"></a>
<span class="sourceLineNo">878</span>    }<a name="line.878"></a>
<span class="sourceLineNo">879</span><a name="line.879"></a>
<span class="sourceLineNo">880</span>    @Override public void clear() {<a name="line.880"></a>
<span class="sourceLineNo">881</span>      forwardList.clear();<a name="line.881"></a>
<span class="sourceLineNo">882</span>    }<a name="line.882"></a>
<span class="sourceLineNo">883</span><a name="line.883"></a>
<span class="sourceLineNo">884</span>    @Override public T remove(int index) {<a name="line.884"></a>
<span class="sourceLineNo">885</span>      return forwardList.remove(reverseIndex(index));<a name="line.885"></a>
<span class="sourceLineNo">886</span>    }<a name="line.886"></a>
<span class="sourceLineNo">887</span><a name="line.887"></a>
<span class="sourceLineNo">888</span>    @Override protected void removeRange(int fromIndex, int toIndex) {<a name="line.888"></a>
<span class="sourceLineNo">889</span>      subList(fromIndex, toIndex).clear();<a name="line.889"></a>
<span class="sourceLineNo">890</span>    }<a name="line.890"></a>
<span class="sourceLineNo">891</span><a name="line.891"></a>
<span class="sourceLineNo">892</span>    @Override public T set(int index, @Nullable T element) {<a name="line.892"></a>
<span class="sourceLineNo">893</span>      return forwardList.set(reverseIndex(index), element);<a name="line.893"></a>
<span class="sourceLineNo">894</span>    }<a name="line.894"></a>
<span class="sourceLineNo">895</span><a name="line.895"></a>
<span class="sourceLineNo">896</span>    @Override public T get(int index) {<a name="line.896"></a>
<span class="sourceLineNo">897</span>      return forwardList.get(reverseIndex(index));<a name="line.897"></a>
<span class="sourceLineNo">898</span>    }<a name="line.898"></a>
<span class="sourceLineNo">899</span><a name="line.899"></a>
<span class="sourceLineNo">900</span>    @Override public boolean isEmpty() {<a name="line.900"></a>
<span class="sourceLineNo">901</span>      return forwardList.isEmpty();<a name="line.901"></a>
<span class="sourceLineNo">902</span>    }<a name="line.902"></a>
<span class="sourceLineNo">903</span><a name="line.903"></a>
<span class="sourceLineNo">904</span>    @Override public int size() {<a name="line.904"></a>
<span class="sourceLineNo">905</span>      return forwardList.size();<a name="line.905"></a>
<span class="sourceLineNo">906</span>    }<a name="line.906"></a>
<span class="sourceLineNo">907</span><a name="line.907"></a>
<span class="sourceLineNo">908</span>    @Override public boolean contains(@Nullable Object o) {<a name="line.908"></a>
<span class="sourceLineNo">909</span>      return forwardList.contains(o);<a name="line.909"></a>
<span class="sourceLineNo">910</span>    }<a name="line.910"></a>
<span class="sourceLineNo">911</span><a name="line.911"></a>
<span class="sourceLineNo">912</span>    @Override public boolean containsAll(Collection&lt;?&gt; c) {<a name="line.912"></a>
<span class="sourceLineNo">913</span>      return forwardList.containsAll(c);<a name="line.913"></a>
<span class="sourceLineNo">914</span>    }<a name="line.914"></a>
<span class="sourceLineNo">915</span><a name="line.915"></a>
<span class="sourceLineNo">916</span>    @Override public List&lt;T&gt; subList(int fromIndex, int toIndex) {<a name="line.916"></a>
<span class="sourceLineNo">917</span>      checkPositionIndexes(fromIndex, toIndex, size());<a name="line.917"></a>
<span class="sourceLineNo">918</span>      return reverse(forwardList.subList(<a name="line.918"></a>
<span class="sourceLineNo">919</span>          reversePosition(toIndex), reversePosition(fromIndex)));<a name="line.919"></a>
<span class="sourceLineNo">920</span>    }<a name="line.920"></a>
<span class="sourceLineNo">921</span><a name="line.921"></a>
<span class="sourceLineNo">922</span>    @Override public int indexOf(@Nullable Object o) {<a name="line.922"></a>
<span class="sourceLineNo">923</span>      int index = forwardList.lastIndexOf(o);<a name="line.923"></a>
<span class="sourceLineNo">924</span>      return (index &gt;= 0) ? reverseIndex(index) : -1;<a name="line.924"></a>
<span class="sourceLineNo">925</span>    }<a name="line.925"></a>
<span class="sourceLineNo">926</span><a name="line.926"></a>
<span class="sourceLineNo">927</span>    @Override public int lastIndexOf(@Nullable Object o) {<a name="line.927"></a>
<span class="sourceLineNo">928</span>      int index = forwardList.indexOf(o);<a name="line.928"></a>
<span class="sourceLineNo">929</span>      return (index &gt;= 0) ? reverseIndex(index) : -1;<a name="line.929"></a>
<span class="sourceLineNo">930</span>    }<a name="line.930"></a>
<span class="sourceLineNo">931</span><a name="line.931"></a>
<span class="sourceLineNo">932</span>    @Override public Iterator&lt;T&gt; iterator() {<a name="line.932"></a>
<span class="sourceLineNo">933</span>      return listIterator();<a name="line.933"></a>
<span class="sourceLineNo">934</span>    }<a name="line.934"></a>
<span class="sourceLineNo">935</span><a name="line.935"></a>
<span class="sourceLineNo">936</span>    @Override public ListIterator&lt;T&gt; listIterator(int index) {<a name="line.936"></a>
<span class="sourceLineNo">937</span>      int start = reversePosition(index);<a name="line.937"></a>
<span class="sourceLineNo">938</span>      final ListIterator&lt;T&gt; forwardIterator = forwardList.listIterator(start);<a name="line.938"></a>
<span class="sourceLineNo">939</span>      return new ListIterator&lt;T&gt;() {<a name="line.939"></a>
<span class="sourceLineNo">940</span><a name="line.940"></a>
<span class="sourceLineNo">941</span>        boolean canRemove;<a name="line.941"></a>
<span class="sourceLineNo">942</span>        boolean canSet;<a name="line.942"></a>
<span class="sourceLineNo">943</span><a name="line.943"></a>
<span class="sourceLineNo">944</span>        @Override public void add(T e) {<a name="line.944"></a>
<span class="sourceLineNo">945</span>          forwardIterator.add(e);<a name="line.945"></a>
<span class="sourceLineNo">946</span>          forwardIterator.previous();<a name="line.946"></a>
<span class="sourceLineNo">947</span>          canSet = canRemove = false;<a name="line.947"></a>
<span class="sourceLineNo">948</span>        }<a name="line.948"></a>
<span class="sourceLineNo">949</span><a name="line.949"></a>
<span class="sourceLineNo">950</span>        @Override public boolean hasNext() {<a name="line.950"></a>
<span class="sourceLineNo">951</span>          return forwardIterator.hasPrevious();<a name="line.951"></a>
<span class="sourceLineNo">952</span>        }<a name="line.952"></a>
<span class="sourceLineNo">953</span><a name="line.953"></a>
<span class="sourceLineNo">954</span>        @Override public boolean hasPrevious() {<a name="line.954"></a>
<span class="sourceLineNo">955</span>          return forwardIterator.hasNext();<a name="line.955"></a>
<span class="sourceLineNo">956</span>        }<a name="line.956"></a>
<span class="sourceLineNo">957</span><a name="line.957"></a>
<span class="sourceLineNo">958</span>        @Override public T next() {<a name="line.958"></a>
<span class="sourceLineNo">959</span>          if (!hasNext()) {<a name="line.959"></a>
<span class="sourceLineNo">960</span>            throw new NoSuchElementException();<a name="line.960"></a>
<span class="sourceLineNo">961</span>          }<a name="line.961"></a>
<span class="sourceLineNo">962</span>          canSet = canRemove = true;<a name="line.962"></a>
<span class="sourceLineNo">963</span>          return forwardIterator.previous();<a name="line.963"></a>
<span class="sourceLineNo">964</span>        }<a name="line.964"></a>
<span class="sourceLineNo">965</span><a name="line.965"></a>
<span class="sourceLineNo">966</span>        @Override public int nextIndex() {<a name="line.966"></a>
<span class="sourceLineNo">967</span>          return reversePosition(forwardIterator.nextIndex());<a name="line.967"></a>
<span class="sourceLineNo">968</span>        }<a name="line.968"></a>
<span class="sourceLineNo">969</span><a name="line.969"></a>
<span class="sourceLineNo">970</span>        @Override public T previous() {<a name="line.970"></a>
<span class="sourceLineNo">971</span>          if (!hasPrevious()) {<a name="line.971"></a>
<span class="sourceLineNo">972</span>            throw new NoSuchElementException();<a name="line.972"></a>
<span class="sourceLineNo">973</span>          }<a name="line.973"></a>
<span class="sourceLineNo">974</span>          canSet = canRemove = true;<a name="line.974"></a>
<span class="sourceLineNo">975</span>          return forwardIterator.next();<a name="line.975"></a>
<span class="sourceLineNo">976</span>        }<a name="line.976"></a>
<span class="sourceLineNo">977</span><a name="line.977"></a>
<span class="sourceLineNo">978</span>        @Override public int previousIndex() {<a name="line.978"></a>
<span class="sourceLineNo">979</span>          return nextIndex() - 1;<a name="line.979"></a>
<span class="sourceLineNo">980</span>        }<a name="line.980"></a>
<span class="sourceLineNo">981</span><a name="line.981"></a>
<span class="sourceLineNo">982</span>        @Override public void remove() {<a name="line.982"></a>
<span class="sourceLineNo">983</span>          checkState(canRemove);<a name="line.983"></a>
<span class="sourceLineNo">984</span>          forwardIterator.remove();<a name="line.984"></a>
<span class="sourceLineNo">985</span>          canRemove = canSet = false;<a name="line.985"></a>
<span class="sourceLineNo">986</span>        }<a name="line.986"></a>
<span class="sourceLineNo">987</span><a name="line.987"></a>
<span class="sourceLineNo">988</span>        @Override public void set(T e) {<a name="line.988"></a>
<span class="sourceLineNo">989</span>          checkState(canSet);<a name="line.989"></a>
<span class="sourceLineNo">990</span>          forwardIterator.set(e);<a name="line.990"></a>
<span class="sourceLineNo">991</span>        }<a name="line.991"></a>
<span class="sourceLineNo">992</span>      };<a name="line.992"></a>
<span class="sourceLineNo">993</span>    }<a name="line.993"></a>
<span class="sourceLineNo">994</span>  }<a name="line.994"></a>
<span class="sourceLineNo">995</span><a name="line.995"></a>
<span class="sourceLineNo">996</span>  private static class RandomAccessReverseList&lt;T&gt; extends ReverseList&lt;T&gt;<a name="line.996"></a>
<span class="sourceLineNo">997</span>      implements RandomAccess {<a name="line.997"></a>
<span class="sourceLineNo">998</span>    RandomAccessReverseList(List&lt;T&gt; forwardList) {<a name="line.998"></a>
<span class="sourceLineNo">999</span>      super(forwardList);<a name="line.999"></a>
<span class="sourceLineNo">1000</span>    }<a name="line.1000"></a>
<span class="sourceLineNo">1001</span>  }<a name="line.1001"></a>
<span class="sourceLineNo">1002</span><a name="line.1002"></a>
<span class="sourceLineNo">1003</span>  /**<a name="line.1003"></a>
<span class="sourceLineNo">1004</span>   * An implementation of {@link List#hashCode()}.<a name="line.1004"></a>
<span class="sourceLineNo">1005</span>   */<a name="line.1005"></a>
<span class="sourceLineNo">1006</span>  static int hashCodeImpl(List&lt;?&gt; list) {<a name="line.1006"></a>
<span class="sourceLineNo">1007</span>    int hashCode = 1;<a name="line.1007"></a>
<span class="sourceLineNo">1008</span>    for (Object o : list) {<a name="line.1008"></a>
<span class="sourceLineNo">1009</span>      hashCode = 31 * hashCode + (o == null ? 0 : o.hashCode());<a name="line.1009"></a>
<span class="sourceLineNo">1010</span><a name="line.1010"></a>
<span class="sourceLineNo">1011</span>      hashCode = ~~hashCode;<a name="line.1011"></a>
<span class="sourceLineNo">1012</span>      // needed to deal with GWT integer overflow<a name="line.1012"></a>
<span class="sourceLineNo">1013</span>    }<a name="line.1013"></a>
<span class="sourceLineNo">1014</span>    return hashCode;<a name="line.1014"></a>
<span class="sourceLineNo">1015</span>  }<a name="line.1015"></a>
<span class="sourceLineNo">1016</span><a name="line.1016"></a>
<span class="sourceLineNo">1017</span>  /**<a name="line.1017"></a>
<span class="sourceLineNo">1018</span>   * An implementation of {@link List#equals(Object)}.<a name="line.1018"></a>
<span class="sourceLineNo">1019</span>   */<a name="line.1019"></a>
<span class="sourceLineNo">1020</span>  static boolean equalsImpl(List&lt;?&gt; list, @Nullable Object object) {<a name="line.1020"></a>
<span class="sourceLineNo">1021</span>    if (object == checkNotNull(list)) {<a name="line.1021"></a>
<span class="sourceLineNo">1022</span>      return true;<a name="line.1022"></a>
<span class="sourceLineNo">1023</span>    }<a name="line.1023"></a>
<span class="sourceLineNo">1024</span>    if (!(object instanceof List)) {<a name="line.1024"></a>
<span class="sourceLineNo">1025</span>      return false;<a name="line.1025"></a>
<span class="sourceLineNo">1026</span>    }<a name="line.1026"></a>
<span class="sourceLineNo">1027</span><a name="line.1027"></a>
<span class="sourceLineNo">1028</span>    List&lt;?&gt; o = (List&lt;?&gt;) object;<a name="line.1028"></a>
<span class="sourceLineNo">1029</span><a name="line.1029"></a>
<span class="sourceLineNo">1030</span>    return list.size() == o.size()<a name="line.1030"></a>
<span class="sourceLineNo">1031</span>        &amp;&amp; Iterators.elementsEqual(list.iterator(), o.iterator());<a name="line.1031"></a>
<span class="sourceLineNo">1032</span>  }<a name="line.1032"></a>
<span class="sourceLineNo">1033</span><a name="line.1033"></a>
<span class="sourceLineNo">1034</span>  /**<a name="line.1034"></a>
<span class="sourceLineNo">1035</span>   * An implementation of {@link List#addAll(int, Collection)}.<a name="line.1035"></a>
<span class="sourceLineNo">1036</span>   */<a name="line.1036"></a>
<span class="sourceLineNo">1037</span>  static &lt;E&gt; boolean addAllImpl(<a name="line.1037"></a>
<span class="sourceLineNo">1038</span>      List&lt;E&gt; list, int index, Iterable&lt;? extends E&gt; elements) {<a name="line.1038"></a>
<span class="sourceLineNo">1039</span>    boolean changed = false;<a name="line.1039"></a>
<span class="sourceLineNo">1040</span>    ListIterator&lt;E&gt; listIterator = list.listIterator(index);<a name="line.1040"></a>
<span class="sourceLineNo">1041</span>    for (E e : elements) {<a name="line.1041"></a>
<span class="sourceLineNo">1042</span>      listIterator.add(e);<a name="line.1042"></a>
<span class="sourceLineNo">1043</span>      changed = true;<a name="line.1043"></a>
<span class="sourceLineNo">1044</span>    }<a name="line.1044"></a>
<span class="sourceLineNo">1045</span>    return changed;<a name="line.1045"></a>
<span class="sourceLineNo">1046</span>  }<a name="line.1046"></a>
<span class="sourceLineNo">1047</span><a name="line.1047"></a>
<span class="sourceLineNo">1048</span>  /**<a name="line.1048"></a>
<span class="sourceLineNo">1049</span>   * An implementation of {@link List#indexOf(Object)}.<a name="line.1049"></a>
<span class="sourceLineNo">1050</span>   */<a name="line.1050"></a>
<span class="sourceLineNo">1051</span>  static int indexOfImpl(List&lt;?&gt; list, @Nullable Object element){<a name="line.1051"></a>
<span class="sourceLineNo">1052</span>    ListIterator&lt;?&gt; listIterator = list.listIterator();<a name="line.1052"></a>
<span class="sourceLineNo">1053</span>    while (listIterator.hasNext()) {<a name="line.1053"></a>
<span class="sourceLineNo">1054</span>      if (Objects.equal(element, listIterator.next())) {<a name="line.1054"></a>
<span class="sourceLineNo">1055</span>        return listIterator.previousIndex();<a name="line.1055"></a>
<span class="sourceLineNo">1056</span>      }<a name="line.1056"></a>
<span class="sourceLineNo">1057</span>    }<a name="line.1057"></a>
<span class="sourceLineNo">1058</span>    return -1;<a name="line.1058"></a>
<span class="sourceLineNo">1059</span>  }<a name="line.1059"></a>
<span class="sourceLineNo">1060</span><a name="line.1060"></a>
<span class="sourceLineNo">1061</span>  /**<a name="line.1061"></a>
<span class="sourceLineNo">1062</span>   * An implementation of {@link List#lastIndexOf(Object)}.<a name="line.1062"></a>
<span class="sourceLineNo">1063</span>   */<a name="line.1063"></a>
<span class="sourceLineNo">1064</span>  static int lastIndexOfImpl(List&lt;?&gt; list, @Nullable Object element){<a name="line.1064"></a>
<span class="sourceLineNo">1065</span>    ListIterator&lt;?&gt; listIterator = list.listIterator(list.size());<a name="line.1065"></a>
<span class="sourceLineNo">1066</span>    while (listIterator.hasPrevious()) {<a name="line.1066"></a>
<span class="sourceLineNo">1067</span>      if (Objects.equal(element, listIterator.previous())) {<a name="line.1067"></a>
<span class="sourceLineNo">1068</span>        return listIterator.nextIndex();<a name="line.1068"></a>
<span class="sourceLineNo">1069</span>      }<a name="line.1069"></a>
<span class="sourceLineNo">1070</span>    }<a name="line.1070"></a>
<span class="sourceLineNo">1071</span>    return -1;<a name="line.1071"></a>
<span class="sourceLineNo">1072</span>  }<a name="line.1072"></a>
<span class="sourceLineNo">1073</span><a name="line.1073"></a>
<span class="sourceLineNo">1074</span>  /**<a name="line.1074"></a>
<span class="sourceLineNo">1075</span>   * Returns an implementation of {@link List#listIterator(int)}.<a name="line.1075"></a>
<span class="sourceLineNo">1076</span>   */<a name="line.1076"></a>
<span class="sourceLineNo">1077</span>  static &lt;E&gt; ListIterator&lt;E&gt; listIteratorImpl(List&lt;E&gt; list, int index) {<a name="line.1077"></a>
<span class="sourceLineNo">1078</span>    return new AbstractListWrapper&lt;E&gt;(list).listIterator(index);<a name="line.1078"></a>
<span class="sourceLineNo">1079</span>  }<a name="line.1079"></a>
<span class="sourceLineNo">1080</span><a name="line.1080"></a>
<span class="sourceLineNo">1081</span>  /**<a name="line.1081"></a>
<span class="sourceLineNo">1082</span>   * An implementation of {@link List#subList(int, int)}.<a name="line.1082"></a>
<span class="sourceLineNo">1083</span>   */<a name="line.1083"></a>
<span class="sourceLineNo">1084</span>  static &lt;E&gt; List&lt;E&gt; subListImpl(<a name="line.1084"></a>
<span class="sourceLineNo">1085</span>      final List&lt;E&gt; list, int fromIndex, int toIndex) {<a name="line.1085"></a>
<span class="sourceLineNo">1086</span>    List&lt;E&gt; wrapper;<a name="line.1086"></a>
<span class="sourceLineNo">1087</span>    if (list instanceof RandomAccess) {<a name="line.1087"></a>
<span class="sourceLineNo">1088</span>      wrapper = new RandomAccessListWrapper&lt;E&gt;(list) {<a name="line.1088"></a>
<span class="sourceLineNo">1089</span>        @Override public ListIterator&lt;E&gt; listIterator(int index) {<a name="line.1089"></a>
<span class="sourceLineNo">1090</span>          return backingList.listIterator(index);<a name="line.1090"></a>
<span class="sourceLineNo">1091</span>        }<a name="line.1091"></a>
<span class="sourceLineNo">1092</span><a name="line.1092"></a>
<span class="sourceLineNo">1093</span>        private static final long serialVersionUID = 0;<a name="line.1093"></a>
<span class="sourceLineNo">1094</span>      };<a name="line.1094"></a>
<span class="sourceLineNo">1095</span>    } else {<a name="line.1095"></a>
<span class="sourceLineNo">1096</span>      wrapper = new AbstractListWrapper&lt;E&gt;(list) {<a name="line.1096"></a>
<span class="sourceLineNo">1097</span>        @Override public ListIterator&lt;E&gt; listIterator(int index) {<a name="line.1097"></a>
<span class="sourceLineNo">1098</span>          return backingList.listIterator(index);<a name="line.1098"></a>
<span class="sourceLineNo">1099</span>        }<a name="line.1099"></a>
<span class="sourceLineNo">1100</span><a name="line.1100"></a>
<span class="sourceLineNo">1101</span>        private static final long serialVersionUID = 0;<a name="line.1101"></a>
<span class="sourceLineNo">1102</span>      };<a name="line.1102"></a>
<span class="sourceLineNo">1103</span>    }<a name="line.1103"></a>
<span class="sourceLineNo">1104</span>    return wrapper.subList(fromIndex, toIndex);<a name="line.1104"></a>
<span class="sourceLineNo">1105</span>  }<a name="line.1105"></a>
<span class="sourceLineNo">1106</span><a name="line.1106"></a>
<span class="sourceLineNo">1107</span>  private static class AbstractListWrapper&lt;E&gt; extends AbstractList&lt;E&gt; {<a name="line.1107"></a>
<span class="sourceLineNo">1108</span>    final List&lt;E&gt; backingList;<a name="line.1108"></a>
<span class="sourceLineNo">1109</span><a name="line.1109"></a>
<span class="sourceLineNo">1110</span>    AbstractListWrapper(List&lt;E&gt; backingList) {<a name="line.1110"></a>
<span class="sourceLineNo">1111</span>      this.backingList = checkNotNull(backingList);<a name="line.1111"></a>
<span class="sourceLineNo">1112</span>    }<a name="line.1112"></a>
<span class="sourceLineNo">1113</span><a name="line.1113"></a>
<span class="sourceLineNo">1114</span>    @Override public void add(int index, E element) {<a name="line.1114"></a>
<span class="sourceLineNo">1115</span>      backingList.add(index, element);<a name="line.1115"></a>
<span class="sourceLineNo">1116</span>    }<a name="line.1116"></a>
<span class="sourceLineNo">1117</span><a name="line.1117"></a>
<span class="sourceLineNo">1118</span>    @Override public boolean addAll(int index, Collection&lt;? extends E&gt; c) {<a name="line.1118"></a>
<span class="sourceLineNo">1119</span>      return backingList.addAll(index, c);<a name="line.1119"></a>
<span class="sourceLineNo">1120</span>    }<a name="line.1120"></a>
<span class="sourceLineNo">1121</span><a name="line.1121"></a>
<span class="sourceLineNo">1122</span>    @Override public E get(int index) {<a name="line.1122"></a>
<span class="sourceLineNo">1123</span>      return backingList.get(index);<a name="line.1123"></a>
<span class="sourceLineNo">1124</span>    }<a name="line.1124"></a>
<span class="sourceLineNo">1125</span><a name="line.1125"></a>
<span class="sourceLineNo">1126</span>    @Override public E remove(int index) {<a name="line.1126"></a>
<span class="sourceLineNo">1127</span>      return backingList.remove(index);<a name="line.1127"></a>
<span class="sourceLineNo">1128</span>    }<a name="line.1128"></a>
<span class="sourceLineNo">1129</span><a name="line.1129"></a>
<span class="sourceLineNo">1130</span>    @Override public E set(int index, E element) {<a name="line.1130"></a>
<span class="sourceLineNo">1131</span>      return backingList.set(index, element);<a name="line.1131"></a>
<span class="sourceLineNo">1132</span>    }<a name="line.1132"></a>
<span class="sourceLineNo">1133</span><a name="line.1133"></a>
<span class="sourceLineNo">1134</span>    @Override public boolean contains(Object o) {<a name="line.1134"></a>
<span class="sourceLineNo">1135</span>      return backingList.contains(o);<a name="line.1135"></a>
<span class="sourceLineNo">1136</span>    }<a name="line.1136"></a>
<span class="sourceLineNo">1137</span><a name="line.1137"></a>
<span class="sourceLineNo">1138</span>    @Override public int size() {<a name="line.1138"></a>
<span class="sourceLineNo">1139</span>      return backingList.size();<a name="line.1139"></a>
<span class="sourceLineNo">1140</span>    }<a name="line.1140"></a>
<span class="sourceLineNo">1141</span>  }<a name="line.1141"></a>
<span class="sourceLineNo">1142</span><a name="line.1142"></a>
<span class="sourceLineNo">1143</span>  private static class RandomAccessListWrapper&lt;E&gt;<a name="line.1143"></a>
<span class="sourceLineNo">1144</span>      extends AbstractListWrapper&lt;E&gt; implements RandomAccess {<a name="line.1144"></a>
<span class="sourceLineNo">1145</span>    RandomAccessListWrapper(List&lt;E&gt; backingList) {<a name="line.1145"></a>
<span class="sourceLineNo">1146</span>      super(backingList);<a name="line.1146"></a>
<span class="sourceLineNo">1147</span>    }<a name="line.1147"></a>
<span class="sourceLineNo">1148</span>  }<a name="line.1148"></a>
<span class="sourceLineNo">1149</span><a name="line.1149"></a>
<span class="sourceLineNo">1150</span>  /**<a name="line.1150"></a>
<span class="sourceLineNo">1151</span>   * Used to avoid http://bugs.sun.com/view_bug.do?bug_id=6558557<a name="line.1151"></a>
<span class="sourceLineNo">1152</span>   */<a name="line.1152"></a>
<span class="sourceLineNo">1153</span>  static &lt;T&gt; List&lt;T&gt; cast(Iterable&lt;T&gt; iterable) {<a name="line.1153"></a>
<span class="sourceLineNo">1154</span>    return (List&lt;T&gt;) iterable;<a name="line.1154"></a>
<span class="sourceLineNo">1155</span>  }<a name="line.1155"></a>
<span class="sourceLineNo">1156</span>}<a name="line.1156"></a>




























































</pre>
</div>
</body>
</html>
